The Atrix's default adapter in an 5v = .85A, while the Ipad's is 5v = 2.1A. Is it safe for the battery to use this charger? I also have been using the ipod charger on my atrix too, should i countinue to use the ipod charger or does that have negitive effects too, ipod charger is 5v = 1A
Atrix: 5v = .85A
Ipod/Iphone: 5v = 1A
Ipad: 5v = 2.1A
Typically, a device will only pull what it needs, amperage-wise. The ratings on power supplies are, to my knowledge, always indications of maximum amperage, not any form of 'forced' current. Thus, the only time you need to be worried is if it is lower than your device's required input. You should be fine with either.
+1
That's correct. I actually spent a lot time researching that kind of stuff because I use electronic cigarettes and finding chargers for them was difficult. Anyways, as long as it's 5V it should be fine. They actually make AC adapters that are iPad "compatible", meaning that they are just rated at 2.1A but it still works with the iPhone which the OP has stated uses a lower Amperage.
ian426 said:
Typically, a device will only pull what it needs, amperage-wise. The ratings on power supplies are, to my knowledge, always indications of maximum amperage, not any form of 'forced' current. Thus, the only time you need to be worried is if it is lower than your device's required input. You should be fine with either.
Click to expand...
Click to collapse
Thank you, both of you.
Would it charge the same rate?
the fact that a device will pull as much as it needs is true, but that is true only to the devices, appliances, and anything that is using the electricity, not storing it - which is the case with the battery. any electrical device uses only as much power as it needs. for example: a 55watt house light bulb will only use .5 amps, (110 volts AC) even though the circuit is wired for 15 amps max.
When it comes to cellphones, the cellphone is the device that uses the power and the battery stores the power. during charging, battery will try to pull as much in as you will give it, unless there is a limiting factor involved. a limiting factor can be a charger it self, which will supply 1.0 amps, .85 amp max, or what ever the case may be. also there may be a limiting factor built in to the phones circuitry it self that would allow only so much to go through ( i seriously doubt though)
By plugging in to 2.1A charger, the battery will try to intake all 2.1 amps,
Pro: you are charging the battery in half the time.
Con: if it doesn't destroy the battery right away, the lifespan of it and usefulness decreases dramatically.
This is called overcharging the battery, do some research on that and you will find out that overcharging the battery is never a good thing.
2.1A is not enough to destroy the battery right away, but if you would have plugged in 5 or 10 amp charger, it probably would, i'm just saying this to explain the concept.
I personally do use a 1.0A charger that i have left over from previous cellphone (touch pro 2) and your ipod charger should be ok too, but I wouldn't use anything bigger then that.
a small experiment that you can conduct which may or may not work. compare the temperatures of the battery/cellphone while it is charging on .85amp charger and 2.1amp, when it is on a bigger charger, it should get a lot hotter, and that is what destroys the battery.
As far as my knowledge goes, i have taken enough classes about electricity and electronics, and have been working in the field for several years, so i hope i was helpful enough and explained it in simple enough terms for everyone.
hlywine said:
the fact that a device will pull as much as it needs is true, but that is true only to the devices, appliances, and anything that is using the electricity, not storing it - which is the case with the battery. any electrical device uses only as much power as it needs. for example: a 55watt house light bulb will only use .5 amps, (110 volts AC) even though the circuit is wired for 15 amps max.
When it comes to cellphones, the cellphone is the device that uses the power and the battery stores the power. during charging, battery will try to pull as much in as you will give it, unless there is a limiting factor involved. a limiting factor can be a charger it self, which will supply 1.0 amps, .85 amp max, or what ever the case may be. also there may be a limiting factor built in to the phones circuitry it self that would allow only so much to go through ( i seriously doubt though)
By plugging in to 2.1A charger, the battery will try to intake all 2.1 amps,
Pro: you are charging the battery in half the time.
Con: if it doesn't destroy the battery right away, the lifespan of it and usefulness decreases dramatically.
This is called overcharging the battery, do some research on that and you will find out that overcharging the battery is never a good thing.
2.1A is not enough to destroy the battery right away, but if you would have plugged in 5 or 10 amp charger, it probably would, i'm just saying this to explain the concept.
I personally do use a 1.0A charger that i have left over from previous cellphone (touch pro 2) and your ipod charger should be ok too, but I wouldn't use anything bigger then that.
a small experiment that you can conduct which may or may not work. compare the temperatures of the battery/cellphone while it is charging on .85amp charger and 2.1amp, when it is on a bigger charger, it should get a lot hotter, and that is what destroys the battery.
As far as my knowledge goes, i have taken enough classes about electricity and electronics, and have been working in the field for several years, so i hope i was helpful enough and explained it in simple enough terms for everyone.
Click to expand...
Click to collapse
I might have to double check that. There is a chance that there is some sort of limiting circuit between the wall and the charger for the Atrix... I am fairly certain at least laptops do so. I will see if I have a stronger charger and I will check the voltage across the leads in the atrix... if I can.
Its not voltage that you should be checking, voltage should be same in all usb chargers, about 5 volts, you should be checking amps
hlywine said:
Its not voltage that you should be checking, voltage should be same in all usb chargers, about 5 volts, you should be checking amps
Click to expand...
Click to collapse
My mistake... realized that after I posted it.
Also -- I do not have any USB charger that is over one amp, so I cannot check this. If anyone has a mutineer and a more powerful charger, they could do so.
The important factor is the Voltage which is at 5V for both the iPad and Atrix chargers. Whether it is rated at 10W or 5W does not matter because that just reflects the capacity for the current. And the charger is "rated" at 2.1 meaning it can handle that current rather than meaning it will force it. The "draw" of current is decided by the phone itself, as long as the Voltage is identical, the other factors should not matter.
If you read the "Summary" here it will say that, with the iPad charger, you can charge an iPhone which is similar to the Atrix in charging specs:
http://support.apple.com/kb/HT4327
And here are a couple more links:
http://www.youtube.com/watch?v=-ZjRm8nkv9Q
http://munnecke.com/blog/?p=836
hlywine said:
the fact that a device will pull as much as it needs is true, but that is true only to the devices, appliances, and anything that is using the electricity, not storing it - which is the case with the battery. any electrical device uses only as much power as it needs. for example: a 55watt house light bulb will only use .5 amps, (110 volts AC) even though the circuit is wired for 15 amps max.
When it comes to cellphones, the cellphone is the device that uses the power and the battery stores the power. during charging, battery will try to pull as much in as you will give it, unless there is a limiting factor involved. a limiting factor can be a charger it self, which will supply 1.0 amps, .85 amp max, or what ever the case may be. also there may be a limiting factor built in to the phones circuitry it self that would allow only so much to go through ( i seriously doubt though)
By plugging in to 2.1A charger, the battery will try to intake all 2.1 amps,
Pro: you are charging the battery in half the time.
Con: if it doesn't destroy the battery right away, the lifespan of it and usefulness decreases dramatically.
This is called overcharging the battery, do some research on that and you will find out that overcharging the battery is never a good thing.
2.1A is not enough to destroy the battery right away, but if you would have plugged in 5 or 10 amp charger, it probably would, i'm just saying this to explain the concept.
I personally do use a 1.0A charger that i have left over from previous cellphone (touch pro 2) and your ipod charger should be ok too, but I wouldn't use anything bigger then that.
a small experiment that you can conduct which may or may not work. compare the temperatures of the battery/cellphone while it is charging on .85amp charger and 2.1amp, when it is on a bigger charger, it should get a lot hotter, and that is what destroys the battery.
As far as my knowledge goes, i have taken enough classes about electricity and electronics, and have been working in the field for several years, so i hope i was helpful enough and explained it in simple enough terms for everyone.
Click to expand...
Click to collapse
thanks live4nyy, i never saw those before. with all the stuff described there, the only conclusion possible is that each device has its built in limiter on how much it will pull while charging, or apple figures that with a bigger charger your battery on ipod/iphone will still last you past the 1 year manufacturers warranty expiration date, but barely past that date, instead of lasting 3-5 years like its suppose to. what ever the case is with apple, i just hope we have a safety built in into our atrix phones. I guess the only way to find out is to actually check the amperage while its charging.
I'm almost positive that the lithium batteries in phones these days are "rated" for specific current and have built in circuits that dictates the "flow", which is also the same thing that causes the battery to go into a "trickle" charge when near capacity. Just for that there has to be some sort of "regulation" happening. See also here:
http://science.howstuffworks.com/environmental/energy/question501.htm
But I agree, better safe than sorry. If you happen to have an iPad charger that you plan on using let me know how it goes. I'm curious as well.
hlywine said:
thanks live4nyy, i never saw those before. with all the stuff described there, the only conclusion possible is that each device has its built in limiter on how much it will pull while charging, or apple figures that with a bigger charger your battery on ipod/iphone will still last you past the 1 year manufacturers warranty expiration date, but barely past that date, instead of lasting 3-5 years like its suppose to. what ever the case is with apple, i just hope we have a safety built in into our atrix phones. I guess the only way to find out is to actually check the amperage while its charging.
Click to expand...
Click to collapse
Related
Alright, so I have a mini USB car charger that is rated at 2.0A (got with GPS) and I just want to make sure the extra amperage is not going to charge my battery too quickly and then kill it in the process. All I have to go on is that my wall charger is capable of only 1.0A and the computer USB is on the level of mA. Does anybody have a car charger or know the maximum amperage possible that these phones can take?
Thanks in advance.
Its to Strong ! I have Crash a PDA with 1.5A
I've used a 2.0a charger but noticed that the battery didn't charge right.
On that note, also noticed that a .5a or 500mA charger after about 6 months killed my battery. (burned out and won't take a full charge anymore)
Recommendation is to stick to 1.0A charging as much as possible as the Wizard's charge circuit is designed at 1.0A charging and monitoring.
DOESN'T MATTER ..if u know the basic Ohms Law..its the max capacity of the charger.(or any source) the current regulating circuits will take care of the real charging current fed to the battery
I charge my phone on my computers USB connection all the time, all computers have a maximum of 500mA USB current.
Amps are pulled from the charger, not pushed to the phone.
Voltages are pushed to the phone, not pulled from the charger.
If the phone draws too much current from the charger, the voltage drops to a point where the maximum power (P (Watt) = U (Voltage) * I (Amps)) of the charger isn't exceeded.
According to the USB specification you need at least 200mA with 500mA recommended +5VDC.
More is never a problem, you could even use a 50A power supply without breaking your phone. Practically spoken: I wouldn't do that.
huh?
I have messed up a few devices before by putting the wrong charger on the device (2.0 amp charger on a droid eris and 1amp charger on the MOTOACTV) Is this a problem with the device's charging circuit? In general it should only pull up what it needs to charge but my devices were messed up?
I returned the first MOTOACTV after it wouldn't leave the boot screen and the second one I got acted funny on 1 amps as well. It charged fine on .75amp charger that came with the device but when I put it on my HTC Dinc charger it shot up from 10% to 20 to 30 etc. all within minutes. Hope I didn't mess this one up too.
Just trying to figure out what the deal is. My phone for sure charges faster when connected to 1amp vs .5amp (computer). This makes sense I understand because the device is able to handle 1amp, but I wonder if it would mess up with a 2amp charger.
Thanks!
The last two posts of 2008 are correct. Your phone is capable of drawing more than 500 mA but less than 1000 mA. If the charger is 1A, 1.5A, 2A, or 50A, it won't make a difference to the phone's charging time or life.
Wrong voltage can be bad, but phones are designed to support USB charging, as a minimum, and 1A to 2A is always safe. As was said in 2008, the charger pushes voltage to the battery, but the battery pulls current from the charger.
That's a really good way of describing it
Pushing and pulling current and voltage is a really good way of describing it.. Given that I am theoretically well within the charging parameters, how comes my phone (Galaxy mini/pop) becomes unusable when its charging (touch screen doesnt touch and screen jumps to new screen without touching?) Am I wrecking my phone?
No, your charger is to blame. Maybe it isn't properly grounded. Phones with capacitive touch screens (not the Wizard! but maybe your phone) can get really weird on some chargers. I have a Nexus One with an aftermarket charger that always makes the touch screen go haywire. When I use an HTC charger, the phone has no problem. As far as I know, the damage isn't permanent, it's just that the sensors get confused. When I disconnect from the charger, turn the phone off, then turn it on, all is well.
My wizards were never bothered by chargers, no matter what kind, as long as they were mini-USB, they were the right voltage. The wizard doesn't take as much current as more modern phones, either.
Hmm. Not properly grounded sounds very plausible. Viva mediterranean circuits. Thanks
Usb chargers will be rated at 5v, which is exactly the correct voltage to charge your device. What you want to make sure is you buy the correct "rated" amperage. Not because it will damage your phone. Amperage only exists as a sum of the power used by the device. You want to find a decent 1amp (1000mA) or higher if you wish, rated usb charger. The the mains charger for your phone is only rated at 1amp, so a 1amp charger is adequate. Avoid 500ma chargers as it will take twice as long to charge and gps / satnav applications will drain the battery even when charging at that rate.
Also if you have a new pc, most of the decent boards will specify 1amp charge even when off if it has on/off charge stated on manufacture details.
Newer phones will charge fine with higher amperage
The myth that charging your device at a faster rate will reduce the life of your device’s battery is false!
If you want quicker charging, look for a wall or car charger that delivers 2100 mA of current at 5 volts higher won't matter.... These lithium ion batteries can handle it... It was just back then if you were to try to put a faster charger in an older battery it (in any cases) just won't charge.
Hey
As a possible solution to the low battery life of the G1, I bought a solar panel charger. (http://www.maplin.co.uk/Module.aspx?ModuleNo=229254) To test it, I went and sat in the sun for a while, with a multimeter. When charging an old Nokia, which has a 3.7v battery, the Nokia's battery was drawing about 200mA. Not a lot, but enough to extend the life of the battery if you're out on a walk.
However, when I plugged the solar panel into the G1 (also a 3.7v battery), it only drew 10-20mA. Now, presumably this is due to some sort of charging circuit in the G1. I know some battery chargers have a diode in to prevent back-flow, and they can have a hefty voltage drop on them. Perhaps the G1 has something similar.
My solution to this would be to have a separate connector that will fit between the G1s battery and the phone to supply current directly to the phone/battery. If the phone is using less current than the solar panel provides, presumably the battery will then charge. Otherwise, the phone will run off the solar panel & battery combined, meaning the battery will last longer. I'd not use the panel when the battery is full, so it wouldn't overcharge, and I would put a 10 ohm resistor in to make sure the charging current is fairly low.
Forgetting about the difficulty of creating the connections, does anyone know anything about the manner in which the G1 handles charging that might be damaged by what I'm proposing?
Why do you post in Development section? Becareful when you created new thread in a sub forum!
Thread Move to Dream accessories.
The battery is irrelevant, it's what the charging-circuitry takes as input that matters. (And, regular lithium-cells usually run at 3.7v, so there's no need to check that (Unless it's some special phosphate-based cell, or something fancy))
The G1 takes 5v.
If i recall correctly, Android handles the power-consumption of the charging circuitry when booted. I think it could be regulated from debugfs... But this is dangerous.
(imfloflo: If the above is true, this is indeed Android development...)
For the battery to charge, you need to supply a higher voltage, and i don't know the limits of the voltage-regulation in the device. This could potentially overload it, rendering the device useless (Unless you have the ability to solder smd components, and the regulator is not part of the SoC).
Also, DO NOT try to charge a lithium-based battery without the charging circuitry, you will end up overcharging/overheating it, and that's NOT something you want to happen (If you don't cool it fast enough after this has happened, it will explode, taking the phone, and whatever else is near (Your hand for example) with it.).
Joushou said:
DO NOT try to charge a lithium-based battery without the charging circuitry, you will end up overcharging/overheating it, and that's NOT something you want to happen (If you don't cool it fast enough after this has happened, it will explode, taking the phone, and whatever else is near (Your hand for example) with it.).
Click to expand...
Click to collapse
Most Li-Ion batteries have a small control circuit built in.. So unless you take the battery apart and try to charge the individual cells, that shouldn't be a problem.
After I broke the usb socket on my wizard, I used to charge the battery with a plain usb cable chopped down the middle with the wires taped onto the battery terminals.. never blew my hand off once.
Disclaimer: I take no responsibility for any damaged or destroyed limbs resulting from attempting idiotic things like this.
goldenarmZ said:
Most Li-Ion batteries have a small control circuit built in.. So unless you take the battery apart and try to charge the individual cells, that shouldn't be a problem.
After I broke the usb socket on my wizard, I used to charge the battery with a plain usb cable chopped down the middle with the wires taped onto the battery terminals.. never blew my hand off once.
Click to expand...
Click to collapse
Yeah, as dubious as those "clip" usb chargers are, I have not heard of anyone's Li-Ion or Li-Po cellphone battery violently venting as a result of charging past 4.1v. Generally with lithium-based cells, if they have been packaged into a battery then there is probably a basic protection circuit against overvolt, undervolt and shorts.
That said, I would still recommend charging through the mini-usb rather than trying to jury rig together some kind of interface to go between the battery and the contacts.
jashsu said:
Yeah, as dubious as those "clip" usb chargers are, I have not heard of anyone's Li-Ion or Li-Po cellphone battery violently venting as a result of charging past 4.1v. Generally with lithium-based cells, if they have been packaged into a battery then there is probably a basic protection circuit against overvolt, undervolt and shorts.
That said, I would still recommend charging through the mini-usb rather than trying to jury rig together some kind of interface to go between the battery and the contacts.
Click to expand...
Click to collapse
Yes, there's usually protection circuitry built-in, but i'm not going to tell someone i don't know, and therefore don't trust the persons knowledge, to put these circuits to the test...
I've been charging Lithium Ion (Both organic solvent and solid polymer) from my lab-supply several times, without blowing them up, but i have seen what happens when it goes wrong (And it's much scarier to see it in real life, than watch the videos...), and therefore i won't tell someone i don't fully trust to charge a cell without a charger.
I'm wanting to swap the .7 amp stock Samsung charger for either a Motorola 950 mAmp or a 1.0 amp charger. Is there any danger to this? I wouldn't assume so, just a faster charge.
Then again I'm no electrician so I don't know.
AntwanL said:
I'm wanting to swap the .7 amp stock Samsung charger for either a Motorola 950 mAmp or a 1.0 amp charger. Is there any danger to this? I wouldn't assume so, just a faster charge.
Then again I'm no electrician so I don't know.
Click to expand...
Click to collapse
I use the 1amp Monster charger and it makes no difference in charging speed. From what others have posted our phones charging chip limits the input no matter what charger you use.
Oh really??? That sure is discouraging... Well thanks for the heads up
I can verify that from personal experience. My charger I leave in the living room is a stock motorola brick originally with the atrix. And I've never noticed any difference between that one and the samsung branded one that came with the phone.
Though the motorola cord is stupid short. Any motorola users out there know what I'm talking about.
Sent from my SAMSUNG-SGH-I777 using XDA App
AntwanL said:
Oh really??? That sure is discouraging... Well thanks for the heads up
Click to expand...
Click to collapse
If it didn't you battery would explode. You can use anything up to 2amp (I've used my playbook charger) and you should be fine, but it won't change the charge speed.
Lithium batteries have a very specific range of operation, and do not tolerate excursions outside that range.
Charging (or discharging) at too high a rate will cause the battery to fail because it increases battery temperature, and because it encourages the growth of dendritic Lithium metal which will short circuit the cathode and anode (increasing temperature). Overcharging and discharging can also cause failures, but most Li-Ion batteries have an internal chip to prevent these situations.
Initially a failing battery will "puff" due to gas generation from the breakdown of electrolyte, but the cells are vented to prevent them from exploding. If the failure is allowed to progress (for instance if the battery is left on charge at too high a rate), the battery will ultimately achieve a condition of "a highly energetic exothermic chemical reaction". Temperatures well above 300ºC are possible - and you can't put it out since it's not combustion, it's a chemical reaction.
It's hot, and it generates a lot of smoke, and it'll set things nearby on fire, but it doesn't actually "explode".
Dang I feel dumb when I read posts by people who are obviously way smarter than me. I mean, I know it's not a high bar, but still.
Sent from my SAMSUNG-SGH-I777 using XDA App
I agree with t most everything. watch a video off a li-ion battery exploding (out lighting on fire) they are very violent. The only gripe I have about that last post is burning and fire is still a chemical reaction... I would compare it to thermite which is a rapid oxidation of two metals (which I'm not sure if that classifies as burning or not? HMM) =P just poking fun
PS. Thermite can "burn" without the presence off oxygen and so it doesn't burn... Just reacts. I'm assuming that li-ion does the same...
Sent from my SGH-I777 using XDA App
Basically, anything with a rating of 0.7 amps or above which shorts D+ and D- together (indicating a dumb charger) will behave the same.
Our internal charging chip limits to 650 mA on AC and 400 on USB. So the only thing you have to watch out for with cheap chargers are:
1) Voltage WAY off from 5 volts (USB standard) at 650 mA load
2) Does not properly signal "dumb charger" causing the phone to charge at 400 mA
So I got a 1.0 mAh USB charger from a Palm device and so far it seems to charge significantly faster.
Not trying to argue the science behind it but that's what i'm seeing.
Sent from my Samsung GT-I9100
@AntwanL
What's the charging time difference?
Sent from my páhhōniē
I don't have a specific time. I can try clocking one once it discharges but it was MUCH faster than stock. Like I'd wait several hours for about 50% and this one does 40-50% charge in about 1 hour if not less
Sent from my Samsung GT-I9100
Might have issues with your other chargers then. That's about what mine charges at.
Sent from my páhhōniē
This is with use which always slows it down with my charger.
But i'm not denying it may be my charger. Anything is possible.
I also noticed the palm cable is a lot thicker. Idk if that's significant in this application though.
Sent from my Samsung GT-I9100
Could be. In general rule of thumb is the thicker the cord the better. Though usually stock usb cables are great. You could try a different cable with the brick.
Sent from my páhhōniē
********
UPDATE 1/10/2012
This below charger and USB adapter WORKS LIKE A CHARM!!!
Charged fast... from 20percent to 100 percent in 2 hours!!!!!
I can now STOP using the OEM charger which is crap!
Admin: Please add this to the list of working prime accessoriesMy first transformer Prime had charging issues, ( would not charge intermittently) and I found the OEM charger that ships with the prime to be sub-par.. So:
After checking out NUMEROUS threads, I just purchased the following charger and USB adapter from Radio Shack to Use with my Prime:
This particular model has been confirmed to work on the original Transformer-
Enercell AC to DC power adapter 12vdc 1.5A
Radio Shack Model # 273-358
http://www.radioshack.com/product/index.jsp?productId=3807944
used together with this USB adapter:
Model #273-227
http://www.radioshack.com/product/index.jsp?productId=3643549
Does anyone know if the above Enercell 12V 1.5A charger should work on the Prime?
see post #104 here in this thread:
http://forum.xda-developers.com/showthread.php?t=1087321&page=11
Also, can someone confirm the Tip polarity I should use? (I believe the prime uses Positive tip polarity just like the original transformer did?)
http://www.12volt-travel.com/knowledgebase/universal-adapter-tip-polarity/
Thanks for any feedback!
********
UPDATE 1/10/2012
This above charger and USB adapter WORKS LIKE A CHARM!!!
Charged fast... from 20percent to 100 percent in 2 hours!!!!!
I can now STOP using the OEM charger which is crap!
Admin: Please add this to the list of working prime accessories
********
UPDATE 1/10/2012
This above charger and USB adapter WORKS LIKE A CHARM!!!
Charged fast... from 20percent to 100 percent in 2 hours!!!!!
I can now STOP using the OEM charger which is crap!
The charger doesn't even get barely warm while it charges... much better than OEM for me!
Admin: Please add this to the list of working prime accessories
I thought I read somewhere that fast charges aren't good for the long term viability of lithium-based batteries.
---------- Post added at 07:27 PM ---------- Previous post was at 07:25 PM ----------
http://batteryuniversity.com/learn/article/how_to_increase_the_runtime_of_your_wireless_device
Simple Guidelines to Prolong Lithium-ion Batteries
Do not discharge Li-ion too low; charge more often.
A random or partial charge is fine. Li-ion does not need a full charge.
Limit the time the battery resides at 4.20/cell (full charge), especially if warm.
Moderate the charge current to between 0.5C and 0.8C for cobalt-based lithium-ion. Avoid ultra-fast charging and discharging.
If the charger allows, lower the charge voltage limit to prolong battery life.
Keep the battery cool. Move it away from heat-generating environments. Avoid hot cars and windowsills.
High heat and full state-of-charge, not cycling, cause short battery life in laptops.
Remove battery from laptop when used on the power grid.
Click to expand...
Click to collapse
Yeah, I would avoid third-party chargers. Have had a lot of problems with them for laptops.
clankfu said:
Moderate the charge current to between 0.5C and 0.8C for cobalt-based lithium-ion. Avoid ultra-fast charging and discharging.
Click to expand...
Click to collapse
Taking 2 hours to charge implies a 0.5C charge rate.
What's the rated voltage, current and wattage of the stock charger anyway?
Please note that the above charger won't work overseas. It's only got 110V.
webbrowser said:
Taking 2 hours to charge implies a 0.5C charge rate.
What's the rated voltage, current and wattage of the stock charger anyway?
Click to expand...
Click to collapse
Stock charger is rated 15 volts DC @ 1.2 Amps
This radio Shack charger That is working for me is rated 12volts DC @ 1.5Amps.
I read the Transformer specs required to chagre are 11V to 15V DC @ 1A to 2A max
This charger fits within these specs, so that is why it works pretty well. The TP and the charger itself do not get hot at all, so I don't think this is causing any issues with the battery. Does anyone think a slightly quicker charge time will harm the battery long term?
Li-Ion Batteries are sensitive to fast charging. While it is within specs, your long term battery life could be affected. There is probably a reason that Asus decided to stay at the very bottom end of the spec.
nslayden said:
Li-Ion Batteries are sensitive to fast charging. While it is within specs, your long term battery life could be affected. There is probably a reason that Asus decided to stay at the very bottom end of the spec.
Click to expand...
Click to collapse
I have done additional research due to above feed back in regard to Li-Ion's sensitivity with faster chargers.
Apparently, you are correct in regard to long term battery life concerns. I have only done 3 charges so far with the Radio Shack charger. I will let it drain down and switch over to the stock for now and just keep this other one as a backup. Is charging at 300MA more than OEM that much more of significant concern?
Better safe than sorry. Hopefully the few charges I have done did not cause any harm.... If the stock charger goes bad again though, I don't know if I would buy another one....
What was interesting is how hot the stock charger becomes in comparison to the radio shack model, which barely gets even warm. I always was a believer that more heat means less efficiency, so I'm somewhat confused, but I don't want to risk shortening the battery life, so I will go back to OEM stock charger for now, but reluctantly.
I wonder How these "alternative" chargers have effected the batteries for others with the original transformer?
That's an expensive charging setup... nearly $40 eek
mazjohn said:
I have done additional research due to above feed back in regard to Li-Ion's sensitivity with faster chargers.
Apparently, you are correct in regard to long term battery life concerns. I have only done 3 charges so far with the Radio Shack charger. I will let it drain down and switch over to the stock for now and just keep this other one as a backup. Is charging at 300MA more than OEM that much more of significant concern?
Better safe than sorry. Hopefully the few charges I have done did not cause any harm.... If the stock charger goes bad again though, I don't know if I would buy another one....
What was interesting is how hot the stock charger becomes in comparison to the radio shack model, which barely gets even warm. I always was a believer that more heat means less efficiency, so I'm somewhat confused, but I don't want to risk shortening the battery life, so I will go back to OEM stock charger for now, but reluctantly.
I wonder How these "alternative" chargers have effected the batteries for others with the original transformer?
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I wouldn't worry if I were you. What you bought is just an adapter with a USB socket. The part which decides how to charge the battery is inside the tablet. The requirement for the adapter is to have the same voltage as the original one and at least as much current ( meaning 1.2A or more). The tablet will only take what it needs.
Be careful http://m.youtube.com/#/watch?desktop_uri=/watch?v=SMy2_qNO2Y0&v=SMy2_qNO2Y0&gl=US
susko said:
Be careful http://m.youtube.com/#/watch?desktop_uri=/watch?v=SMy2_qNO2Y0&v=SMy2_qNO2Y0&gl=US
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It's always easy to scare people. It does say in the description of the movie that he did it by removing the protection circuit. They are designed with protection, so of course they will blow up without one.
Dude why so serious?
It was a joke thus a smiley was implemented. It is quite difficult to do that to a battery. Although I have seen some insane people in the RC hobby community destroy expensive cars and helicopter this way.
Lipo+ignorance=Hollywood style explosions
I saw the smile, don't worry. It is just that most of people, especially when they do not have the knowledge about something, tend to see the bad part (I'm also guilty of this, not in this domain though ).
So, it was not anything against you, the video is entertaining. I just wanted to put people at ease.
Charging Issues
It does not matter the type of rechargeable battery, any "quick charge" will reduce the battery life. I personally don't think 300mA is that much of a difference, but am sure the battery life would be reduced somewhat over time. Nor would I worry much from just 3 charges.
However I don't think we should have to shell out an additional $40 just because Asus can't build quality components. Mine quit charging consistently yesterday (week and a half). I guess we can put it in the same category as GPS...non professional and spotty at best.
EatMy45 said:
However I don't think we should have to shell out an additional $40 just because Asus can't build quality components. Mine quit charging consistently yesterday (week and a half). I guess we can put it in the same category as GPS...non professional and spotty at best.
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Don't worry, ASUS will remove the charger from the SPECs and say it is no longer supported, problem solved...
Hey guys,,,,
Wanna ask something here...
I have an idea to buy a power bank/portable charger, instead of buy a spare battery.
But there are alot of choice, start from 2000mah-10000mah capacities, offerring 2-6 USB port.
Each product offered different USB port voltage and ampere.
For the example, each USB port supplying 5.3V / 5.0V and 1A / 2A / 0.8A....
Do you know which one match/compatible with our phone?
From what i remember from my physics class the should all be compatible. Cellphone battery is 4.3V, so it needs a power higher than that to be re-charged, a pc usb port usuall supplies power at 5V, whilst the A is the amount of energy let through, so the difference in A value impacts the speed at which the portable device recharges the phone battery. The same voltage carrying 1Ah reachrges the batter in half the time needed by one carrying it a 0.5A. Furthermore cell batteries have an internal chip which regulates the tension transmitted. The mAh is the total capacity of the recharging device (or toal amount of A it can store and supply over one h unit of time)
I think the the amperage of charger shouldn't be more 1.0 A. More amperage will charge the battery quickly, but will short his life.
so, I should go for 5V and something under 1.0A?
a product that nearly match those config was sanyo eneloop.
provided 2 USB port 5V and 0.5A or 2x for 1.0A.
physcodelic said:
so, I should go for 5V and something under 1.0A?
a product that nearly match those config was sanyo eneloop.
provided 2 USB port 5V and 0.5A or 2x for 1.0A.
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At spec of Sanyo Eneloop i see when you use only one of USB port and charge one device you will have charging output of 5V and 1A. When you use both ports you will have charging output of 5V and 0.5A (500mA).
tanec said:
At spec of Sanyo Eneloop i see when you use only one of USB port and charge one device you will have charging output of 5V and 1A. When you use both ports you will have charging output of 5V and 0.5A (500mA).
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I see....
Thanks for the explanation...
Maybe I should go for Sanyo, cause the other products was made by some unknown/unfamiliar brand from chinese.
Better to choose a wellknown brand right?
That's because as i explained before Amperes is the amount of energy that passes through a conductor, if a device has max output of 1A if you use two ports it will obviously split down the tension output. Amperes have nothing to do with battery life, it's not gonna do anything if you charge them faster, what matters is tension (V) which is maintained constant by the chip within the battery itself which gives the battery the 4.25V constant it needs controlled also by the cellphones internal regulatory hw. Poli-ion batteries use an impulse charge system, it's not continuative, that's why constant regular tension is important, aamof recharging the cellphone from car charger does affect negatively battery life. Poli-ion batteries if left unused have a very slow discharge rate, 1% a month, nonetheless life is shortened by about 25% after 100 full cycles and another 25% after 3-4 years of life, and they have no memory effect, so it is always best not to let the battery discharge completely ...Go for better known brand, not for the quality of the product per say but for more guarantees on support and warranty claims
Rudjgaard said:
That's because as i explained before Amperes is the amount of energy that passes through a conductor, if a device has max output of 1A if you use two ports it will obviously split down the tension output. Amperes have nothing to do with battery life, it's not gonna do anything if you charge them faster, what matters is tension (V) which is maintained constant by the chip within the battery itself which gives the battery the 4.25V constant it needs controlled also by the cellphones internal regulatory hw. Poli-ion batteries use an impulse charge system, it's not continuative, that's why constant regular tension is important, aamof recharging the cellphone from car charger does affect negatively battery life. Poli-ion batteries if left unused have a very slow discharge rate, 1% a month, nonetheless life is shortened by about 25% after 100 full cycles and another 25% after 3-4 years of life, and they have no memory effect, so it is always best not to let the battery discharge completely ...Go for better known brand, not for the quality of the product per say but for more guarantees on support and warranty claims
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I'am sorry if I can't understand your explanation fully...
So you mean higher Ampere output than original charger was safe, Am I right?
I bought already sanyo power bank, seems like a nice quality.
Charging time almost same like it was charged on PC USB port.
Thank for your complete explanation
tho I cant understand that completely (stupid me)
physcodelic said:
I see....
Thanks for the explanation...
Maybe I should go for Sanyo, cause the other products was made by some unknown/unfamiliar brand from chinese.
Better to choose a wellknown brand right?
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That is the best way. I was trying one solar charger, with included LiPo battery with 2600 mAh. The charger was with dimensions of an iphone and can charge included battery from sun and from regular USB charger. His price was something around 6-7 pounds. This kind - Portable-iphone-2600MAh-USB-Solar-Panel-Battery-Charger-for-Mobile-Phone-MP3-MP4 (search in ebay, because i'm a new user and can post links ). Included battery can keep charge for 1 full and one 70% charge of mi Xperia Mini Pro with standart 1160mAh battery. Hope this can help you. The advantages of sanyo charger is that, you can use regular AA battery that you can buy it from every where.
P.S. Sorry for my english. Hope you can understand me
your english was understandable bro
ahhh...a solar charger...will keep this in my mind.
traveling too much with smartphone will be easy with a solar charger