former atrix2 owner looking at battery/case options - HTC One X+

Yes I did search but most threads actually lead me to things I''ve already accomplished with previous phones.
Hello guys
I have a One X + and you're probably familiar with its battery life and the options for fixing it.
My plan is to do something similar to what I did with my Atrix2.
I cut the battery cover and the back of the otter box to allow a larger aftermarket battery. The outer rubber shell made this a very stealthy mod. My plan now is to achieve a similar outcome. My service is spotty right now so please forgive me for not posting any links or references.
You may be wondering why I won't just buy a case that uses the charging pin system. The reason for this is that in my line of work, mild splash resistance and good shock resistance is a must. The mugen actually appears to make the phone less durable overall . Ouch.
imagine you were to take a small rechargable battery and stick it to the back of your phone. The only issues now are finding a 90° micro usb cord and plugging it in and cutting a case to fit the battery behind it's outer rubber shell. You may think I would be better off with an otterbox and a flashlight/ powerdock. This is a great idea and I may buy one but this phone, like all very skinny phones, tends to cramp up my hand when typing, like now.
Actual question
If a battery was added (something along the lines of a small credit card shaped 2000mah battery) and the heat from it didn't get too dangerous for the phone (big "if) , would I not be actually ADDING to the life of the phone by primarily draining the battery pack and leaving it on full time? The phone would essentially be charging all of the time so it may actually be worse...
I'm going to move forward soon but I would love to get some input before I do from someone who knows a bit about batteries. The heat may force me to go with someting fully external but we'll see. The current trend of slim smart phones makes me think any batteries I buy that I don't use now will eventually be useful :/.
Thanks for reading all of that!!!
Onyx

second thoughts
I think, after much consideration, I have decided to purchase the toughest case I can find with a solid or partially solid back. I will then go the route of Velcro to attach a small to medium sided external battery to the back of the case. I've found enough rubber plugs and the like that I can splash proof a power pack pretty well. Also, I just dont think it's worth it to cut, pry and modify when in the end , the phone will still be charging instead of accurately reading battery drain.

Related

Metal Battery Cover

Hey guys - does anyone know of any after-market battery covers for the HD that would be metal - specifically for the purpose of attaching to a magnet? I purchased one of those magnetic "cradle" kits that is basically just a big magnet you stick onto whereever, with a little metal slab that you stick onto the back of your phone. Then - you can just stick the phone up close to the magnet and it sticks - a perfect low-profile car cradle. The metal slab that sticks to the back of the phone is thin - it doesn't really stick out any further than the camera housing - but it still isn't as sleek as just the phone by itself. I thought a replacement battery cover that sticks to the magnet would be perfect. So... does anyone know of any? Or perhaps a vendor that could custom-machine one?
SolusCado said:
Hey guys - does anyone know of any after-market battery covers for the HD that would be metal - specifically for the purpose of attaching to a magnet? I purchased one of those magnetic "cradle" kits that is basically just a big magnet you stick onto whereever, with a little metal slab that you stick onto the back of your phone. Then - you can just stick the phone up close to the magnet and it sticks - a perfect low-profile car cradle. The metal slab that sticks to the back of the phone is thin - it doesn't really stick out any further than the camera housing - but it still isn't as sleek as just the phone by itself. I thought a replacement battery cover that sticks to the magnet would be perfect. So... does anyone know of any? Or perhaps a vendor that could custom-machine one?
Click to expand...
Click to collapse
I made my own magnetic car holder solution. Didn't cost much and can't imagine it work better than this...
I can't see what you've done there... It looks like some sort of metal on the battery itself, so that the regular cover works fine... What is that? How is it affixed?
Jouh has placed 2 razor blades on the battery.
Cool! I'm going to try that...
just don't take ur phone to the airport...... they might think ur going to use the razorblades for other non magnetic purposes.
Ohh! Good point! I would have completely forgotten about them and then been really screwed - I actually have to run my mobile through an X-ray every day at work... That could be an issue. Oh well - back to the drawing board...
just do the same with any thin metal i.e. sheet steel.
spzero said:
just do the same with any thin metal i.e. sheet steel.
Click to expand...
Click to collapse
I really wouldn't recommend directly attaching the phone to strong magnetic sources. It may impede the functionality, reduce or affect the battery operation, interfere with the many antennas in the phone, not to mention run the risk of corrupting memory sticks etc?
The phone itself isnt that heavy so probably wouldnt need a strong magnet, but you'd want to use something quite strong just to hold it in place. Imagine driving over a speed bump or pot hole which dislodges the phone and makes it go sliding across your dash board and out of an open window. (worst case scenario..)
If youre looking for a quick release holder I would recommend something that you clip the phone into like those hip holsters and then find one that has a socket connection to a window mount.
makaveli2g said:
I really wouldn't recommend directly attaching the phone to strong magnetic sources. It may impede the functionality, reduce or affect the battery operation, interfere with the many antennas in the phone, not to mention run the risk of corrupting memory sticks etc?
The phone itself isnt that heavy so probably wouldnt need a strong magnet, but you'd want to use something quite strong just to hold it in place. Imagine driving over a speed bump or pot hole which dislodges the phone and makes it go sliding across your dash board and out of an open window. (worst case scenario..)
If youre looking for a quick release holder I would recommend something that you clip the phone into like those hip holsters and then find one that has a socket connection to a window mount.
Click to expand...
Click to collapse
I used the same razors and the same magnet (This one) with my SE P1i for 1½ year without any issues.
And the phone doesn't move 1 mm even driving over the biggest speed bump in Sweden.
makaveli2g said:
I really wouldn't recommend directly attaching the phone to strong magnetic sources. It may impede the functionality, reduce or affect the battery operation, interfere with the many antennas in the phone, not to mention run the risk of corrupting memory sticks etc?
The phone itself isnt that heavy so probably wouldnt need a strong magnet, but you'd want to use something quite strong just to hold it in place. Imagine driving over a speed bump or pot hole which dislodges the phone and makes it go sliding across your dash board and out of an open window. (worst case scenario..)
If youre looking for a quick release holder I would recommend something that you clip the phone into like those hip holsters and then find one that has a socket connection to a window mount.
Click to expand...
Click to collapse
I honestly couldn't think of one thing that a magnet could have an effect on in the phone, certainly not the memory. The only type of memory that is affected by magnets are HDD (because the data on the disks is stored magnetically) and credit cards (once again, data stored magnetically). However, RAM/ROM is completely different and relies on gates and latches to store data, neither affected by magnet. Not to mention even if it did have an HDD (like old school mp3 players/iPod) it would take a strong magnet (mainly electromagnet) to corrupt the memory. Likewise, I can't foresee it having any affect on the battery or interfering with the antenas (unless you're using some super strong magnet....which you're likely not)
One of the only build quality problems i have with the Touch HD is that the battery cover creaks when pressed in certain spots.
To revive this topic, does anybody know of an actual aftermarket battery cover for this phone, preferably metal?
I searched google to find no results. It seems like it would be a good idea to make these
You can also shave the inside of the battery cover with a small sander. Than add ANY kind of magnet that will than fit inside the cover. The plastic cover is THICK so you can shave enough for some type of magnet.
I would also like a metal/rubber etc back cover. The quality of the orginal cover is driving me nuts..
Has anyone found this kinda aftermarket item?
sudo_x60s said:
I would also like a metal/rubber etc back cover. The quality of the orginal cover is driving me nuts..
Has anyone found this kinda aftermarket item?
Click to expand...
Click to collapse
Any news on that topic?

[Q] ..legend internal battery flap/door broken

.. my apologies if this not the appropriate place to post this, but I need help..the little battery door/flap that clips into place which holds the actual battery in place and covers the SIM card (not the black battery cover/antenna) has broken!!.. Now whenever the phone drops or is handled rough enough to cause the battery cover/antenna to come off, the battery slides out of place and the phone turns off.. this happens multiple times throughout the day..i'm ready to throw this phone into the far reaches of this galaxy to say the least... if thats not bad enough, the little chrome peice that surrounds the sensor part of the optical trackpad on the front of the phone has fallen out .. it really takes away from the beauty of the phone!.. any idea where I can find replacement parts for these???.. used or new, it doesn't matter ... If ANYONE can help me i'd be indebted to you for ever!!!
Try contacting HTC.. They make the phones and they should know.. And btw.. Handle your phone a little more careful..
Sent from my Legend using XDA App
Damn, i've always been afraid of that happening expirimenting and having to remove the battery frequently. Don't know anything to help you, sorry
I have the same broken part. Been looking around for this part for a while with no luck. HTC want £44 to replace it, only by sending it in for a repair. They will not sell me the part and I cannot find it anywhere.
I will keep an eye on this thread for more suggestions.
Tape? Although it would have to stick to the aluminum unibody. See if it works! My head's imagery seems like it could.
Yes, my Legend is basically held together with tape. Without it, the battery cover comes of very easily. It's been like this for about 6 weeks now.
I've also been in to my local Vodafone shop to see what they say. They will not repair it as it's a moving part.
Buy your Legend a silicone or rubber case. That should prevent black cover from falling off.
Sent from my HTC Legend
why don't u fill the gap between the black part and ur battery with a soft rubber?
i think it'll solve ur problem
I want this part too. The center clip mechanism has failed due to taking the cover off regularly.
Oh my goodness, I should stop switching SIMs every now and then. I'm scared, actually.
branch8 said:
Damn, i've always been afraid of that happening expirimenting and having to remove the battery frequently. Don't know anything to help you, sorry
Click to expand...
Click to collapse
I was thinking of placing a secundairy antenna on that part, so you would stil have an small antena if the lid is missing. or maybe even better reception.
If you still have problems with the battery cover/flap, here's what i did on my legend: Take out the battery, look inside the battery compartment, you'll see the four battery contacts/pins, and right next to them you'll see there is a small black square rubber, glued to a metal spring underneath. The spring is heavily glued to the chassis/plastic body. I took a small (but strong) set of tweezers, and pulled the thing off the phone (the spring + the small rubber attached to it), and my phone works perfectly now, with the broken flap. The thing is that the spring is actually pushing the battery out, for "easier" removal, thus making the battery loose contact/fall out on every shake/impact.
I think that the design of this part is the worst about the legend. On mine I have experienced that the grip is weaker and weaker, and now comes off quite easily (unintended).

[Q] Verizon DNA rant (sorry ahead of time)

The plastic charging door broke on my phone, and Verizon wants me to ship my device back for this instead of sending me the little piece of plastic, with a possible $200 charge for abuse? The battery life is not great on the device I use it all day so I have to charge it often, I can't stand when MFG's put these little covers on but the phone looks like crap without it.
Anyone else have this and a better way to get the little charging door or a case recommendation so I can't see it? I love the otterbox stuff but both cases are too bulky for the DNA in my opinion.
Most people ripped of that little flap. If you get a new one it will probably come off again, so just keep your phone.
As far as cases, idk. I keep my phone naked.
orangechoochoo said:
Most people ripped of that little flap. If you get a new one it will probably come off again, so just keep your phone.
As far as cases, idk. I keep my phone naked.
Click to expand...
Click to collapse
Agreed, I prefer it naked as well, but this thing looks bad without the door, the phone has such clean lines!
When and if mine comes off or falls apart, I will be making another one that's completely removable, basically like a rubber plug fabricated to fit snugly into the slot when I'm not charging carefully formed to prevent damage or binding.
My rezound didn't have a cover, and I take good care of my devices but in my home and work environment I'm surrounded by dust and dirt. My DNA inside would get lots of stuff like dust and even tiny pieces of hay.
My OCD would get the best of me, and every time I would connect the charger I would think of dust and airborne particles being abrasive to the micro USB port.
It can be annoying to have to use a tool each time I remove the cover but I'm really glad its there. I realize how frustrating it can be though.
Sent from my DNA... S-Off like a baws
Can u just buy a wireless charger? VZ has the Nokia (with discount) for under $40.
You ship your phone and they will send you back a refurbished phone.
the_passenger said:
Can u just buy a wireless charger? VZ has the Nokia (with discount) for under $40.
You ship your phone and they will send you back a refurbished phone.
Click to expand...
Click to collapse
Duh. That is a really good idea, I feel retarded for not thinking about that when it broke!:good: Do you have a link, all the ones I see are $59.99 and up? It's still a go at this price, but if I can get for under $40 even better!
CharliesTheMan said:
When and if mine comes off or falls apart, I will be making another one that's completely removable, basically like a rubber plug fabricated to fit snugly into the slot when I'm not charging carefully formed to prevent damage or binding.
My rezound didn't have a cover, and I take good care of my devices but in my home and work environment I'm surrounded by dust and dirt. My DNA inside would get lots of stuff like dust and even tiny pieces of hay.
My OCD would get the best of me, and every time I would connect the charger I would think of dust and airborne particles being abrasive to the micro USB port.
It can be annoying to have to use a tool each time I remove the cover but I'm really glad its there. I realize how frustrating it can be though.
Sent from my DNA... S-Off like a baws
Click to expand...
Click to collapse
If you make one of those, make me one too!! I'll send ya a few bucks!
My door broke off as well, and I only remove it to charge while on the road away from my wireless charger. I just happened to snap it off while taking the door off, so I still have it, but it has come away from the phone's body.
A monumentally stupid design choice that was clearly done to induce the purchase of wireless chargers.
Fastlivin said:
My door broke off as well, and I only remove it to charge while on the road away from my wireless charger. I just happened to snap it off while taking the door off, so I still have it, but it has come away from the phone's body.
A monumentally stupid design choice that was clearly done to induce the purchase of wireless chargers.
Click to expand...
Click to collapse
I think the funny/sad thing here is the immediate claim from Verizon to me on the phone that it's probably abuse. I asked the support rep if he had seen the plastic hinge before. Abuse, total crap when it breaks in a month... if it had a little stronger battery it probably would have taken me two months for it to wear out!!!
Mine broke off so know I just stick it in. Can't help but wonder if its necessary to meat the IPX-5 water protection?
DROIDESP said:
I think the funny/sad thing here is the immediate claim from Verizon to me on the phone that it's probably abuse. I asked the support rep if he had seen the plastic hinge before. Abuse, total crap when it breaks in a month... if it had a little stronger battery it probably would have taken me two months for it to wear out!!!
Click to expand...
Click to collapse
What an idiot. Lol. Mine came off after a few weeks too and I rarely used the charging port since I have a wireless charger.
Sent from my Limited Edition HTC6435LVW
DROIDESP said:
The plastic charging door broke on my phone, and Verizon wants me to ship my device back for this instead of sending me the little piece of plastic, with a possible $200 charge for abuse? The battery life is not great on the device I use it all day so I have to charge it often, I can't stand when MFG's put these little covers on but the phone looks like crap without it.
Anyone else have this and a better way to get the little charging door or a case recommendation so I can't see it? I love the otterbox stuff but both cases are too bulky for the DNA in my opinion.
Click to expand...
Click to collapse
Same thing happened to me with the plastic cover. I called Verizon told them it fell off while trying to open it to charge the phone they sent me one and said I wouldn't get charged the fee for damage. I received the new one and have not been charged any fee and its been a few months so don't worry about them charging you if you replace it.
Sent from my HTC6435LVW using Tapatalk 2
For people having poor battery performance - make sure you check your usage statistics! For example, there is a bug with Latitude where it will constantly ping for location, so Maps will take up a huge amount of battery life. Check and make sure there aren't any programs or servicing taking up an unusual amount of battery life. For me, battery life has been amazing once I fixed the Maps issue (there is a thread somewhere if anyone has any specific questions on that).
I've had my DNA for less than 24 hours and my battery door came off already haha. It's okay though, doesn't look that bad without it and I work in an office so I don't see any immediate danger to the device. Love it.
DROIDESP said:
The plastic charging door broke on my phone, and Verizon wants me to ship my device back for this instead of sending me the little piece of plastic, with a possible $200 charge for abuse? The battery life is not great on the device I use it all day so I have to charge it often, I can't stand when MFG's put these little covers on but the phone looks like crap without it.
Anyone else have this and a better way to get the little charging door or a case recommendation so I can't see it? I love the otterbox stuff but both cases are too bulky for the DNA in my opinion.
Click to expand...
Click to collapse
Sounds like maybe you should take it back and get an iPhone? Seriously, I have the DNA as well. Any phone that has the rubber door flap is going to break, period. Just leave it off. You can resolve battery life by rooting it, and loading a ROM/Kernel that has better battery support.
Lastly, in re: the way it looks, the case, etc. Sounds like you're just unhappy. Try getting a phone you like better? They provide a 15 day return period for folks just like you.
DROIDESP said:
Duh. That is a really good idea, I feel retarded for not thinking about that when it broke!:good: Do you have a link, all the ones I see are $59.99 and up? It's still a go at this price, but if I can get for under $40 even better!
Click to expand...
Click to collapse
you have to have corp discount to see it for $37.
other wise Microsoft store has it for $49. http://www.microsoftstore.com/store...0-Wireless-Charging-Plate/productID.259027800

[Review] ZeroLemon 8,000 mAh battery case review for Galaxy S20+

The ZeroLemon S20+ battery case is not for everyone. In order to fit 8,000 mAh of extra reserve battery power into a phone case, one has to accept the many compromises, such as the extra thickness, extra weight, more difficulty operating the phone with just one hand, and finding a more suitable place to carry the phone with you when going out. For longtime users of battery cases, none of these are dealbreakers. It's just something you expect and accept for being able to extend the battery life of your phone by days.
_____
*Pros:
-Great amount of extra battery life, good for gaming, heavy GPS navigation, and continuous video and photo-taking.
-Grippy and soft case.
-Mostly compatible with my Whitestone Dome TGSP.
-Easy to slip in and slip out.
-Wireless charging still works.
-Doesn't dampen speaker quality.
_____
*Neutral:
-Pushes up on the bottom-right corner of my TGSP.
_____
*Cons:
-None (for a battery case).
In my case, I've been using ZeroLemon battery cases for such a long time (Note 10, S10+, S9+, S8+, S7), I'm cool with all the compromises. Besides, I don't use the case all the time, every day. I only need it for those occasions when I'm going to somewhere where I know I'll be taking lots of pictures and videos, such as amusement parks and fairs. I also use it when I'm playing emulation games on the phone with a Bluetooth gamepad paired up.
As has been the case for a couple of years now, I'm happy to report that ZeroLemon continues to refine and improve the design and build quality of their battery cases year after year. The S20+ battery case is composed of two types of materials - a high density matte-black TPU component that makes up the top, bottom, sides, and camera lens portion of the case, and a smooth, grippy, matte-black portion that wraps around the battery on the back of the case. Both material types feel good in the hands, and any smudges or oils left on top can easily be wiped away.
https://drive.google.com/open?id=1dEQd8zCcMIQmP2r7m5ExQUtyLngYtuUv
https://drive.google.com/open?id=1uOqej18pH-Jfh9whheuuaccp2HmHfr0f
https://drive.google.com/open?id=1ntGVVhIZaM0xxUC8qP4Td4baY3Qlspi9
https://drive.google.com/open?id=1BnvF06pKJ41z-YgmLbZ6yYyLBdQAqNlD
All the buttons and holes lined up perfectly, and there was no decrease in speaker quality. Button presses do require extra effort, with the power button requiring more pressure compared to the volume up and volume down buttons. As a result, it took me a while to get used to taking screenshots on the phone. The battery case button on the back of the case is very clickity and responsive. A single click will activate the battery, and a 3-second hold will turn it off. Can't get simpler than that.
To my pleasant surprise, wireless charging worked just fine through the thick case. The phone doesn't get Fast Charged but it's definitely better than having to take out the phone from the case first.
https://drive.google.com/open?id=1_hBlNwIyCeSY6QDvt8jAlEtupd_CwNpC
https://drive.google.com/open?id=1pUv8CigN7aKjPUnSAwv8wbewCCQ7bUha
When charging the phone normally from the battery case, it also operates in a non-Fast Charge way. Having Qualcomm Fast Charge would've been nice but since this isn't a powerbank that I want to disconnect from as soon as possible, it's not a big deal to me.
Having a glass screen protector is a MUST for me, and I'm very happy to report that the case is 95% compatible with my Whitestone Dome Glass. As you can see from my pictures, the case doesn't make contact with the glass on the top and the sides, causing no lifting. The bottom of the case, however, does make slight contact. Fortunately, that hasn't resulted in air bubbles forming but it did introduce a squiggly line on the bottom-right corner of my screen protector. That has been slightly annoying but on the positive side, I can't see the line when the screen is turned on and lit up. When I take the phone out of the case, the squiggly line disappeared.
https://drive.google.com/open?id=1xR9AqVKd-Rede6Ebm-gsUub6z1BkA3FC
https://drive.google.com/open?id=1Roztxhsn1nKExAHLK9nrq71iIW4OhtBM
https://drive.google.com/open?id=1Un1AtTqZIy9yyMsQew-Hto2KdNswmv1c
https://drive.google.com/open?id=1Snin_kR7prXTY26EW6d1mGV7usvIenOn
https://drive.google.com/open?id=1l4vRzf8AtC01kN9hbPozMi597oyGfrIz
All in all, I'm quite happy with the ZL S20+ battery case. It might be unabashedly thick and bulky, but it provides a peace of mind that I can get through hours of gameplay or heavy use of the camera without getting all antsy and nervous. Being able to do wireless charging is awesome, and I'm happy that there is no compromise to the speaker quality this time around. For their future battery cases, I wish ZeroLemon would make the bottom lip of the case a bit thinner in order to avoid contacting a glass screen protector. 9.5 out of 10.
Good review except it leaves out the most important part - the battery life lol
Thanks for your review, I too have just purchased both the case and protector and very happy indeed with it.
I had bought one of these for a previous device. After 4 months, it started to fail, refused to hold a charge, just started to not work. I contacted the manufacturer, and their response was not only surprising in their candidness but sad that they were selling them knowing this:
The case is meant to only last at a maximum of 6-8 months. They KNOW these cases don't work after that and stated it quite clearly in their response to me.
Since then, I've avoided this manufacturer of "battery" cases.
Nice
Zerolemon actually told me that the life expectancy of these batteries is about 6 months. What exactly is the point of carrying around what essentially is a massive case attached to the device then if it only lasts 6 months?

Batteries and rear glass adhesive driving me NUTS

Okay, story time. Some time ago, the battery in my Z5c swelled up and pushed the battery cover off the back of the phone. I replace the battery myself, & also order new (supposedly OEM) adhesive for the back glass. It does NOT stick on well, popping off one side or the other every few minutes. After fighting it for a while (ordering additional replacement adhesive and trying to re-clean and re-apply it a couple more times), it seems to finally stay in place.
Fast-forward a few months. I see the back glass coming off again. Oh, great, here we go again. I peel it off, and find that the replacement battery is a *little* inflated. Not by much, and not nearly as much as the original battery, but even though it seems to barely be a problem, it's also clear that the battery cover is not skin-tight as it was when it went in. Perhaps it was "enough" that given the tolerances inside, it still managed to push the back glass off. Okay, fine: I bought 2 replacement batteries at the time, so I'll put the other one in.
Fast-forward another few months to a couple of weeks ago. SAME BLASTED THING. Battery barely inflated, back cover coming off, but not really 100% clear whether the battery *really* is the culprit, or whether this adhesive I keep buying is just crap, or if I'm not applying it correctly.
Well, this time I'm running into the same problem trying to re-apply it that I did the first time around: it simply Will. Not. Stay. Put. I've tried the usual tricks I have read about: namely, making sure everything is squeaky-clean, and warming up the adhesive before pressing the back glass onto the phone, and then giving it a little time to cure with something heavy on top of the phone (if I had some clamps, I might try to use those instead). It helps for a couple of hours, but then the back cover just comes RIGHT off again.
Here is my hypothesis: either my phone's chassis is was not quite up to manufacturing standards, or I keep re-assembling it wrong, or something along those lines, because the battery sticks up slightly above the surrounding black frame. And what I can see when the back first starts coming off is that it is slightly "bowing" a bit...the top and bottom are sunk slightly below the plastic frame, but the middle bows out to the point where it rises slightly ABOVE the plastic frame. It's as if either the battery is sitting too high inside the phone, or the frame around the battery is sitting too low.
I have tried taking it all apart again and putting it all back together, but no dice.
Has anybody ever experienced anything like this? It's super frustrating. It seems clearly like a design defect. I just wish I could understand how things are different right now vs. when it was originally assembled at the factory.
Right now I'm sitting here seriously thinking that maybe the answer to this is to layer TWO back adhesive stickers on top of each other, in order to raise the edges of the glass back up enough above the battery that the back won't bow out anymore...
Argh!
...oh, also: and are genuine Sony batteries REALLY this crap in terms of quality?? If so, they should be ashamed and should have recalled many of these phones. I have yet to run into a genuine Sony Z5c battery that doesn't have at least a small build-up of gases within the battery pack after a few short months of use. I have been shying away from third-party batteries by no-name companies, but at this point I'm thinking that those could only be worse if they managed to spontaneously burst into flames.
In case anybody else who is struggling with the same thing ever ends up stumbling across this in the future, I seem to have finally managed to successfully tackle this problem. I finally got more pre-cut adhesive in, and yes: at least in my case, stacking two of them on top of each other has done the trick. (It's not easy lining them up in order to apply them to each other, either...I can tell you that much.)
I don't know if maybe all the adhesive that is out on the market is not "genuine" Sony and so not built to the same spec (maybe the genuine article is much thicker?), or if my particular phone's manufacturing tolerances are just outside the norm (either the battery is sticking up farther than it should, or the edges of the frame are sunk in further than they should be), or what. But using 2 stacked on top of each other instead of 1 seems to be the perfect thickness, allowing for the back glass to remain flush with the plastic frame's edges while also remaining perfectly flat.
I can tell you that at least on my phone, this is still not enough to ensure a tight water seal (pressure sensor doesn't change with increasing outside pressure). But it's hard to know if that's due to the way the back is applied, or some other issue elsewhere that's entirely unrelated.
ARGH. Nope. It lasted a lot longer than previous attempts, but now the upper-left corner, where the camera lens is, is already starting to lift off again.
This is *such* a stupid design.
Try using B7000 industrial glue from Aliexpress or other vendors, it can still be unglued by heat if repairs are needed, but should stay glued better and longer then these precut adhesives which are low in quality...
Thanks for your thread. I can feel your frustration! I'm having problems with the flash LED making weird green shadows in photos (like here https://forum.xda-developers.com/t/camera-flash-bleed.3368004/) I was thinking about opening the back cover to try and fix this and maybe install a new battery and a new camera lens while I'm at it. But now I'm afraid to open it up. I am pretty sure that a this point all "original" replacement parts that are available are fake. Should I ever find the courage: Is the back cover and camera lens made from one piece or must they be replaced separately?
Try to get the OEM adhesive strips and battery.
3m makes all sorts of industrial double sided strips. Get the right thickness if you go that route.

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