Hello,
I was looking at getting a USB adapter for mains so i could charge my S2 using the USB cable provided. The original charger outputs 5V=0.7A.
I've seen a car USB adapter that outputs 5V=0.8A. Does the 0.1A increase affect the charge? Or will it be ok to use on my S2?
Furthermore, I've seen 2 mains USB adapters which output 5V=0.5A and the other is 5V=1A. Which of these would be better to get?
i'm curious about this as well. but if you look at other threads,
quite a number of people says that higher current rate doesn charge the phone faster or damage it. the S2 will capped the charging current to 650mA.
so no worries mate.
I occasionlly charge my sgs2 with my ipad-charger, which got 5V=2A.
Haven't got any problems with that, but it doesn't feel faster.. probably not recommdable. :-/
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SGS2 capped to 650mA via Mains charger and 400mA via USB.
Can only be changed by using a custom kernel.
Using a charger with a higher mA wont hurt the phone, it just wont take advantage of it.
I think this is related Electrical knowledge.
for example, 5V x 1A = 5W (power). That means the transfer max. output power is 5W. If your transfer power is larger than your phone demand, that's OK. Will not damage the phone.
But i dont' know the phone charging demand
I notice that the standard AC/Charger is 0.7A output. Possible to use another AC/Charger rated at 1.0A output? What is the USB output anyways? Thanks in advance for any help or suggestions.
PS Still considering rooting or not (will it void my warranty?) *WUSS*
I am using my Galaxy Tab 2.5A charger to charge the S2. It still takes about the same amt of time to charge up full.
I believe the charger current rating is the max current it can supply. The S2 will still draw current at it's own max...maybe 0.7A.
Doesn't matter what charger you use on it, if it's greater than 0.7A The S2 will limit itself to 0.7A.
if you want raise charging amperage, you can help me looking for someone, who will change(raise) it in kernel...
http://forum.xda-developers.com/showthread.php?t=1132649
Given the same voltage (i.e 5V for USB), it's the resistance of the phone that determines how much current is drawn from the charger. Therefore anything above the rated 0.7A would work fine and dandy.
Thanks to all the fellas that responded! More than enough information provided.
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The standard for usb is 500mA/5v and this is what you get out of most computers, usb hubs and so on. AC to usb chargers will also run at that more often than not. AC chargers on the other hand usually run hotter, up to 1A and more. I have a 1A and a 1.5 amp and both charge this phone at exactly the same rate. It was not so with my N1 where the 1.5 was quite a bit faster, certainly appears like there is throttling going on as others stated. I would be curious why they did this when some other ODMs are selling phones with 1A and higher rated chargers.
look in the source code, wall charging is capped at 650 mA and USB is capped at 450 mA. and this makes sense why samsung included a 0.7 Amp charger.
Guys,
I got a charger from my new Nook Tablet, and that sucker's strong.
It's a microUSB, 5V 1.9A charger that I'm kinda scared to use to charge SGS2.
Is it too much? Will SGS2 regulate the current to what it needs? Will I burn my battery down?
I believe the phone regulates max charge current to 750mA anyway....so I don't think there'd be risk.
1.9A is the maximum amps that the charger is able to supply, as Elythor said, who controls how much current is used is the phone itself.
its a very good
because the charger will no more overload because the phone take only 750 mA (950 max if you use script inda siyah kernel), but the charger can give much more power then even 1A.
good charger!
I bought this wall charger from Amazon and when I charge my phone with it, it shows up as charging via USB instead of AC which means it'll be pulling 450 mA instead of 650 mA. Is there any way to make it detect the wall charger properly?
Voltage is controlled mainly by charger, not phone, so I think your phone charges with 600 mA.
But if you charge with lower voltage, your battery will live longer.
I believe you have to short the middle two data leads.
yokuyuki said:
I bought this wall charger from Amazon and when I charge my phone with it, it shows up as charging via USB instead of AC which means it'll be pulling 450 mA instead of 650 mA. Is there any way to make it detect the wall charger properly?
Click to expand...
Click to collapse
The only way to do that is by increasing USB charging current to 650mA.
Swyped from my Samsung Galaxy SII
LoL ! I have official wall charger which i got with my Galaxy s2 and my phone detect it as USB btw it happens on a custom rom that i am using.
I used ex tweak app from play store ( Works only with siyah kernal) and set usb to 650 mAh
Like I said, short the two data points.
http://forum.xda-developers.com/showpost.php?p=23007631&postcount=1
Hi,
If I connect the S3 to USB3 port, should it charge faster than USB2 port?
I've tried that, and it looks like charging speed is the same. According to "Battery Monitor Widget" it's around 500ma. So I wonder if it's supported on the S3.
I'm using Sotmax rom, if it matters.
Thanks
You can tune it up by flashing siyah kernel and use stweaks.
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Thanks!
Is there a risk in doing so? Can it harm my phone in any way?
Animor said:
Thanks!
Is there a risk in doing so? Can it harm my phone in any way?
Click to expand...
Click to collapse
Yes if you set it to high you can damage your phone and you can burn down your usb port from your pc.
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Thanks.
So what should I set there in order to be safe?
I want my S3 to be able to charge from both USB2 and USB3. Meaning, if I connect it to USB2 to draw 500mA, and if I connect it to USB3 to draw more (900/1000 mA, I'm not sure).
Can it be done safely?
Think you have to change the settings manual every time you switch usb port.
There is no option to select automatically.
I personally think you don't get a lot time winst with charging faster tro usb3.
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its related to usb port mah , not related to usb3 or usb 2
Please also keep in mind that high speed charging may also have the implication to induce faster deterioration of the battery. I would highly advise OP to keep to original specifications in order to ensure you keep your manufacturers warranty and possibly prolong the life cycle of the battery and eliminate the possibility of hardware malfunction.
But it's high speed charging only compared to USB2.
If I connect the S3 to wall AC with the original Samsung adapter, it charges with 1A.
USB3 is 900mA, which is less than that. So it shouldn't effect the battery life.
My only concern now is what happens if I set USB charge limit to 900mA, but connect it to USB2 port.
Firstly, it's not the type of USB that matters, it's the power source itself (wall socket or USB). It's safe to draw more power from the wall socket, obviously. Both the USB3.0 and USB2.0 will be affected the same. The current transfer will be the same. By increasing the mA, there will be increased chances of damaging your USB port.
So, 900mA will affect both types of USB ports in the same way.
ok, thank you.
I was under the assumption that if I configure the device to draw 900mA from USB ports, then it will try to take 900mA also from USB2 port - but since this port is only able to transfer 500mA, it will behave the same as before.
Am I wrong about that?
Animor said:
ok, thank you.
I was under the assumption that if I configure the device to draw 900mA from USB ports, then it will try to take 900mA also from USB2 port - but since this port is only able to transfer 500mA, it will behave the same as before.
Am I wrong about that?
Click to expand...
Click to collapse
IMHO and with my reasonable knowledge of PC's - the USB 1.x/2.x ports can only provide 500mA. This is the USB port spec.
USB 3.x can provide up to 900mA. These both apply if the USB port is not a charging port.
The information quoted below is taken from Wikipedia:
Power
The USB 1.x and 2.0 specifications provide a 5 V supply on a single wire from which connected USB devices may draw power. The specification provides for no more than 5.25 V and no less than 4.75 V (5 V±5%) between the positive and negative bus power lines. For USB 3.0, the voltage supplied by low-powered hub ports is 4.45–5.25 V.[45]
A unit load is defined as 100 mA in USB 2.0, and 150 mA in USB 3.0. A device may draw a maximum of 5 unit loads (500 mA) from a port in USB 2.0; 6 (900 mA) in USB 3.0. There are two types of devices: low-power and high-power. A low-power device draws at most 1 unit load, with minimum operating voltage of 4.4 V in USB 2.0, and 4 V in USB 3.0. A high-power device draws at most the maximum number of unit loads permitted by the standard. Every device functions initially as low-power but the device may request high-power and will get it if the power is available on the providing bus.[46]
Some devices, such as high-speed external disk drives, require more than 500 mA of current[47] and therefore may have power issues if powered from just one USB 2.0 port: erratic function, failure to function, or overloading/damaging the port. Such devices may come with an external power source or a Y-shaped cable that has two USB connectors (one for power+data, the other for power only) to be plugged into a computer. With such a cable, a device can draw power from two USB ports simultaneously.[48]
A bus-powered hub initializes itself at 1 unit load and transitions to maximum unit loads after it completes hub configuration. Any device connected to the hub will draw 1 unit load regardless of the current draw of devices connected to other ports of the hub (i.e. one device connected on a four-port hub will draw only 1 unit load despite the fact that more unit loads are being supplied to the hub).[46]
A self-powered hub will supply maximum supported unit loads to any device connected to it. In addition, the VBUS will present 1 unit load upstream for communication if parts of the Hub are powered down.[clarification needed][46]
Charging ports and accessory charging adapters
The USB Battery Charging Specification of 2007 defines new types of USB ports, e.g., charging ports.[49] As compared to standard downstream ports, where a portable device can only draw more than 100 mA current after digital negotiation with the host or hub, charging ports can supply currents above 500 mA without digital negotiation. A charging port supplies up to 500 mA at 5 V, up to the rated current at 3.6 V or more, and drop its output voltage if the portable device attempts to draw more than the rated current. The charger port may shut down if the load is too high.
Charging ports exist in two flavors: charging downstream ports (CDP), supporting data transfers as well, and dedicated charging ports (DCP), without data support. A portable device can recognize the type of USB port from the way the D+ and D- pins are connected. For example, on a dedicated charging port, the D+ and D- pins are shorted. With charging downstream ports, current passing through the thin ground wire may interfere with high-speed data signals. Therefore, current draw may not exceed 900 mA during high-speed data transfer. A dedicated charge port may have a rated current between 500 and 1500 mA. There is no upper limit for the rated current of a charging downstream port, as long as the connector can handle the current (standard USB 2.0 A-connectors are rated at 1500 mA).
Before the battery charging specification was defined, there was no standardized way for the portable device to inquire how much current was available. For example, Apple's iPod and iPhone chargers indicate the available current by voltages on the D- and D+ lines. When D+ = D- = 2V, the device may pull up to 500 mA. When D+ = 2.0 V and D- = 2.8 V, the device may pull up to 1000 mA of current.[50]
Dedicated charging ports can be found on USB power adapters that convert utility power or another power source — e.g., a car's electrical system — to run attached devices and battery packs. On a host (such as a laptop computer) with both standard and charging USB ports, the charging ports should be labeled as such.[49]
To support simultaneous charge and sync, even if the communication port doesn't support charging a demanding device, so called accessory charging adapters are introduced, where a charging port and a communication port can be combined into a single port.
The Battery Charging Specification 1.2 of 2010 [14] makes clear, that there are safety limits to the rated current at 5000 mA coming from USB 2.0. On the other hand several changes are made and limits are increasing including allowing 1500 mA on charging ports for unconfigured devices, allowing high speed communication while having a current up to 1500 mA and allowing a maximum current of 5000 mA.
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Hope this helps to clarify for you.
Yes, and as far as I know, standard charge rate is 475mA via USB and 1000mA via wallet.
These values can be changed with SiyahKernel but I would not recommend to do it.
When ever possible, I take the wallet charger and get double charging speed.
After finally getting a usb3 card in my pc (onboard usb3 broken).
S3 only can use usb2 cable so doesnt even have usb3 support.
So the question is charging at higher rates in usb2 mode on a usb3 port.
Using stweaks I adjusted to 900ma
In galaxy charging current it reports max 500 now 899 avg 500, not conclusive.
same app on charger reports max 900 now 999 avg 900
usually it reports on usb without stweaks change 475 for all 3.
I had theory the galaxy charging current app had issues reporting avg and max right for 900ma so reduced AC charge to 900ma but that still reports 900 for avg and max. just the now dropped to 899.
for the usb3 the avg and max now state 600 but those 2 are still way off 900.
Max is the only one to take into consideration as per info on Google play.
I can get 900 out of a usb 2 port. Usually the ports aren't restricted to what they can put out. The onus is on the connecting device to only draw 475 or 900 for usb 2/3
This could be different with a usb card not connected directly to the motherboard though. What did you get?
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are you sure? my guess is that the now is the accurate one, with max been buggy.
I can get 900 out of my usb2 ports also but I only left it going for a few seconds as that has them out of spec.
It looks like max is buggy and always reports same as avg.
--edit--
yeah I read the description and he says what you said. It would seem there is a hard cap somewhere on my phone to 600ma charging via usb then and 900 via AC.
avg and max report 500 on my usb 2 ports and 600 on my usb3 ports.
now reports 899 on them all.
--edit again--
found the cause its my dock, the dock claims 1amp output yet its capping to 600ma. With the cable direct between phone and usb it shows 900 on both my usb2 and 3 ports.
you know if any s3 docks that are 900ma compatible?
Yes im sure. The developer of the app says this on Google play description.
Edit... i should read entire posts before replying
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@rootSU,
What is your recommendation for this issue?
Do you recommend configuring stweaks for more then 500mA for USB? I don't want to harm my device or my PC in any way...
Animor said:
@rootSU,
What is your recommendation for this issue?
Do you recommend configuring stweaks for more then 500mA for USB? I don't want to harm my device or my PC in any way...
Click to expand...
Click to collapse
Can't make recommendations at this point in time. You didn't answer my question(s)
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rootSU said:
Can't make recommendations at this point in time. You didn't answer my question(s)
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But you've asked chrcol, not me...