Database Users

Someone explain this?

I've got this battery with the phone when I traded it over craigslist, and I knew for a fact with research that this wasn't the original battery. It felt old, and gave me about 5 hours of battery life no matter what I did to conserve life. It wouldn't fully charge, it'd get stuck at 77% and not move, but after a restart it would be a hundred but start draining right away. It was also very soft and I could easily bend the battery in half. So I ordered a 1500mAh off ebay for $6, and whoaa day and night difference, I get a little more than 12 hours with auto brightness and moderate-heavy usage, but I know these Chinese battery's aren't too good, and they will start crapping out.
So I got a replacement from T-Mobile, works fine, But now I have 3 batteries for one phone that gets me through the day, and since the battery I got first was ****, I said let me take the sticker apart and see the deal with these batteries.
Mind you, the battery looks and feels like a real legit HTC battery, and I thought it was the real one when I got the phone, had no idea that it was fake. It states it's a 1400mAh on the black sticker and 1000mAh on the actual battery housing under the sticker.
Striped it away and on the part where there is the connector, it says "YY-HT DESIRE HD"
Now I really don't know or can't tell if it's a fake battery or not, can anyone let me know how I can test it? What to look for?
Here are some pictures.

well my original battery states that it's 1400mAh, and through battery tests, it reports that it's 1377 mAh so I'm pretty sure that yours isn't genuine

How do you find out the true mAh of a battery without having to peel off the sticker?

xdviper said:
How do you find out the true mAh of a battery without having to peel off the sticker?
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Putting it on a load over time and calculating mA/h

Battery replacement, is it worth it and can you fit a larger one inside?

Hi everyone,
I have had my Nexus 4 for over a year and have noticed that the battery just doesn't last as long as it used to. So I ask, those who have replaced it, is it worth it and do you see a difference? Also, can you fit a larger battery inside with the glass back still intact? Like maybe a 2500 size instead of the stock 2100?

It's not worth it until you rule out other causes of the battery draining. Software is the problem 99 times out of 100. You should only ever replace the battery with an original one.

22sl22 said:
Hi everyone,
I have had my Nexus 4 for over a year and have noticed that the battery just doesn't last as long as it used to. So I ask, those who have replaced it, is it worth it and do you see a difference? Also, can you fit a larger battery inside with the glass back still intact? Like maybe a 2500 size instead of the stock 2100?
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After about 500 cycles, a lithium rechargeable battery will have lost upwards of 20% of its original capacity. If you charge more than once a day, you could have reached that point by now. A new battery is about $20 off eBay. I can't comment on the difference it actually makes because I got my Nexus 4 with a broken screen and replaced the screen and battery at the same time.
You can also extend your battery life by flashing a custom kernel like HellsCore (which is slightly undervolted) and play around with underclocking, undervolting, different governors, and running on fewer cores. For example, I've kept mine at a dual core 1.2GHz with intellidemand governor (CM11), and it still runs smoothly most of the time, with only the occasional hint of stutter. And if you want to play a game or something, just crank everything back up. And of course there's the obvious battery-saving methods, like turning screen brightness down, disabling GPS/wi-fi, synching less often, and limiting data to 3G instead of 4G. Plus the less obvious methods like Greenify and/or Tasker.
To my knowledge, there's no higher capacity batteries, or even external battery cases for the Nexus 4.

Planterz said:
After about 500 cycles, a lithium rechargeable battery will have lost upwards of 20% of its original capacity. If you charge more than once a day, you could have reached that point by now. A new battery is about $20 off eBay. I can't comment on the difference it actually makes because I got my Nexus 4 with a broken screen and replaced the screen and battery at the same time.
You can also extend your battery life by flashing a custom kernel like HellsCore (which is slightly undervolted) and play around with underclocking, undervolting, different governors, and running on fewer cores. For example, I've kept mine at a dual core 1.2GHz with intellidemand governor (CM11), and it still runs smoothly most of the time, with only the occasional hint of stutter. And if you want to play a game or something, just crank everything back up. And of course there's the obvious battery-saving methods, like turning screen brightness down, disabling GPS/wi-fi, synching less often, and limiting data to 3G instead of 4G. Plus the less obvious methods like Greenify and/or Tasker.
To my knowledge, there's no higher capacity batteries, or even external battery cases for the Nexus 4.
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DrFredPhD said:
It's not worth it until you rule out other causes of the battery draining. Software is the problem 99 times out of 100. You should only ever replace the battery with an original one.
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Thanks for the replies.
I've tried software tweaks, kernel tweaks, everything, greenify all things in that sorts, different kernel profiles etc. It makes a difference but still not as good as it used to be. I might as well try replacing it, I can always put the old battery back in if I want, not that hard to change. There's a Galaxy S3 battery, I think its the same size, not sure with a higher capacity, same size, same voltage etc I could go for that if I wanted to :good:
Sent from my Nexus 4

22sl22 said:
There's a Galaxy S3 battery, I think its the same size, not sure with a higher capacity, same size, same voltage etc I could go for that if I wanted to :good:
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Have you seen what the N4's battery and connector looks like? That ain't gonna work. It won't fit, for one thing. Wrong shape, and the N4 battery is pretty slim because it doesn't have a stiff protective covering (it's actually kinda flexible - be careful prying it off the adhesive) and even if you found a battery that did fit, you'd have to rig up some sort of splice for the connector, which would probably take up more space, defeating the purpose of finding a higher capacity battery.
I did find a couple battery cases. There's the Mugen 4500mAh, but it's both freaking huge and freaking expensive (nearly 1" thick, $90), and the ZeroLemon, but it's also freaking huge, only has a (removable) 2200mAh battery, and I can't find one anywhere actually for sale.

Planterz said:
Have you seen what the N4's battery and connector looks like? That ain't gonna work. It won't fit, for one thing. Wrong shape, and the N4 battery is pretty slim because it doesn't have a stiff protective covering (it's actually kinda flexible - be careful prying it off the adhesive) and even if you found a battery that did fit, you'd have to rig up some sort of splice for the connector, which would probably take up more space, defeating the purpose of finding a higher capacity battery.
I did find a couple battery cases. There's the Mugen 4500mAh, but it's both freaking huge and freaking expensive (nearly 1" thick, $90), and the ZeroLemon, but it's also freaking huge, only has a (removable) 2200mAh battery, and I can't find one anywhere actually for sale.
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Yeah I've seen all the cases already. Too big. I don't mind doing surgery on the battery to make it work but only if I can find a higher capacity one that's gonna fit I'll consider it.
Sent from my Nexus 4

22sl22 said:
Yeah I've seen all the cases already. Too big. I don't mind doing surgery on the battery to make it work but only if I can find a higher capacity one that's gonna fit I'll consider it.
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I've thought about trying getting a new back cover (minus the glass), cutting a chunk out of it, and rigging up a larger capacity battery. It's the connector that stops me (that, and my lack of knowledge and tools to do so).

Planterz said:
I've thought about trying getting a new back cover (minus the glass), cutting a chunk out of it, and rigging up a larger capacity battery. It's the connector that stops me (that, and my lack of knowledge and tools to do so).
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Just do this. This is where I got the surgery idea. Bit complex but it seems like its worth it :good:
http://forum.xda-developers.com/nexus-4/general/4200mah-nexus-4-internal-battery-t2239829
Sent from my Nexus 4

There is no way you're going to put an s3 battery into a nexus 4 and have good results, please put any notion of this out of your head now, it's pretty absurd. Also you may struggle to use your original battery after replacement, a lot of people damage it during removal.

DrFredPhD said:
There is no way you're going to put an s3 battery into a nexus 4 and have good results, please put any notion of this out of your head now, it's pretty absurd. Also you may struggle to use your original battery after replacement, a lot of people damage it during removal.
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Look at the above thread, its possible and doable, not absurd.
I'll be careful when taking it out, its easier with a hair dryer because of the adhesive under the battery
Sent from my Nexus 4

Anyone who did it is an absolute idiot, but whatever, melt your phone and burn your face off if you want. Notice how there are no follow up posts from anyone even a month down the line in that thread, I think they all died (but seriously, their battery is ****ed now and they're too embarrassed to post anything)
But here's some videos of lithium batteries exploding from incorrect charging
https://www.youtube.com/watch?v=SMy2_qNO2Y0
https://www.youtube.com/watch?v=VswaFOrVM6I
Also the fact you want to use a samsung battery has me even more concerned
https://www.google.co.uk/search?q=s...HV0QXy24CoCQ&ved=0CAYQ_AUoAQ&biw=1366&bih=643
http://www.androidpolice.com/2013/0...-burn-from-a-galaxy-s3-samsungs-off-the-hook/ (This girl used a fake s3 battery, in an actual s3. You're gonna put a fake s3 battery in a Nexus 4?!?!?!)

I agree with what DrFredPhD said, LIB are very dangerous if tampered with or altered physically.

If you're really having drastic differences in battery life then you're supposes to then I would suggest you replace your N4 battery with an original one itself, don't go for any other options

stazi34 said:
I agree with what DrFredPhD said, LIB are very dangerous if tampered with or altered physically.
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Yeah, running/charging multiple lithium batteries typically isn't a good idea. But the videos that DrFredPhD posted aren't what you'll get with a cell phone battery.
Li-ion and Li-po batteries in commercial devices have built-in circuitry to prevent overcharging, overdischarging, reverse polarity, and short circuits. If you short it, the circuitry kicks in and kills everything. Putting it back in the device/charger resets the kill switch. Same if the charge gets too high, or the discharge gets to low. Circuity switches the battery off, and prevents overcharging and runaway discharging.
Those videos show batteries that don't have that circuitry. Either it was removed, or they're cells used by hobbiests and were purchased unprotected. Unprotected cells are available for hobbiests (R/C stuff, high-powered flashlights, etc) and some use them because the circuitry in protected cells leeches a bit of your juice. In an R/C car, that could mean a few more seconds and one more completed lap, in an R/C plane or helicopter, a few more seconds of air time before you crash. But there are obvious dangers.
Those dangers don't exist with commercial protected batteries. Well, they do, but that's when you buy a cheap knock-off from China, or the cell is defective, like those Sony and Dell laptops that were catching fire several years ago.
But even with protected commercial batteries, problems can occur (just not explosively dangerous ones). If the cells are mismatched in capacity, or one has a higher charge than the other, the higher capacity one will try to charge the other one, and the battery life of both will suffer, plus since they're also trying to power the device or receive a charge, they'll get really hot and can be damaged. Running identical cells is one thing. Charging should be done separately so that they start off the same. It's not the same as with a laptop or electric car, because they have additional circuitry to make things safe. It's also not the same as using a battery bank to power/charge your device, because effectively, that's just the same as plugging into a USB jack.

Battery Monitor Widget Pro is reporting around 1700mAh or less to me now so I'm wondering if my battery also needs to be replaced... Happy to use quality OEM but can it be done myself or should I pay someone?

DroidBois said:
Battery Monitor Widget Pro is reporting around 1700mAh or less to me now so I'm wondering if my battery also needs to be replaced... Happy to use quality OEM but can it be done myself or should I pay someone?
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You can replace it yourself. You'll need a T5 TORX driver for the screws at the bottom of the phone, and then something thin to pry the halves apart, preferably plastic so you don't damage your phone's body. It helps to heat it up with a hairdryer to soften the glue.
As for that app, I don't know if I trust it.

The Battery issue

I've been doing tons of research on this whole battery draining issue on the 6p. I cant seem to find a simple solution around this tired issue that plenty of people seem to be having. My battery has about 3 Hrs of screen on time before it dies. I've tried shutting down all kinds of connection settings, clearing the cache and even factory reseting my phone. I just recently tired the android O beta and that didn't help either. All I want is to figure out if my battery needs to be replaced or is it the software that's killing my battery. I've even called google and they cant help, Huawei wants to charge me $165 for a replacement battery and thats way too much. Has anybody found a fix that doesn't involve rooting the phone?

ev713 said:
I've been doing tons of research on this whole battery draining issue on the 6p. I cant seem to find a simple solution around this tired issue that plenty of people seem to be having. My battery has about 3 Hrs of screen on time before it dies. I've tried shutting down all kinds of connection settings, clearing the cache and even factory reseting my phone. I just recently tired the android O beta and that didn't help either. All I want is to figure out if my battery needs to be replaced or is it the software that's killing my battery. I've even called google and they cant help, Huawei wants to charge me $165 for a replacement battery and thats way too much. Has anybody found a fix that doesn't involve rooting the phone?
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It is NOT the software. There is no fix for a badly degraded battery. Replace your battery. Buy the battery online and then shop around for a local shop to install it if you're not able to.

ev713 said:
I've been doing tons of research on this whole battery draining issue on the 6p. I cant seem to find a simple solution around this tired issue that plenty of people seem to be having. My battery has about 3 Hrs of screen on time before it dies. I've tried shutting down all kinds of connection settings, clearing the cache and even factory reseting my phone. I just recently tired the android O beta and that didn't help either. All I want is to figure out if my battery needs to be replaced or is it the software that's killing my battery. I've even called google and they cant help, Huawei wants to charge me $165 for a replacement battery and thats way too much. Has anybody found a fix that doesn't involve rooting the phone?
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Click to collapse
Are you dying at 60% or lower? Does it happen when you open the camera? Does the phone shut off when a random loud sound plays or something of sorts? I ask cause that is what is happening to me. Random reboots? I don't think that is "battery" related per-say.

Have you tried installing a battery stats app that can help narrow down the culprit?
More details would probably help others help you.
Does it fully charge?
How long does the battery last, not just screen on time?
3 hours SOT doesn't sound terrible. I've heard worse.
How old is the phone?

Had the same problem...I bought a new original battery from ebay and replaced the old battery by myself. To be honest, there was not much improvement...now with a medium usage (whatsapp, wifi or 4g always on, some clash of clans/clash royale gaming) I get 3hrs30min SOT at the late evening, never more. And also I'm on francokernel so I should easily get 4hrs but nothing.
Anyway, unless you are an expert, I don't recommend you to replace the battery for yourself because, sadly, the N6P is a phone impossible to open up without damaging it especially the rear glass...surprisingly, on my case it didn't break but it's all scratched and I should buy a new one.
Furthermore, now my battery doesn't charge anymore up to 100%...it's stuck at 93% and only if i unplug and plug again the phone it gets to 98%...to get 100% i have to plug and unplg it several times and wait something like 30min to get from 98% to 100%. I don't know what caused this problem but it looks like there's no solution...software and hardware battery calibration didn't do anything. Maybe the battery I bought was faulty...
In conclusion, buy the new battery but ask someone expert to replace it if you aren't.

WhiteWashed said:
Had the same problem...I bought a new original battery from ebay and replaced the old battery by myself. To be honest, there was not much improvement...now with a medium usage (whatsapp, wifi or 4g always on, some clash of clans/clash royale gaming) I get 3hrs30min SOT at the late evening, never more. And also I'm on francokernel so I should easily get 4hrs but nothing.
Anyway, unless you are an expert, I don't recommend you to replace the battery for yourself because, sadly, the N6P is a phone impossible to open up without damaging it especially the rear glass...surprisingly, on my case it didn't break but it's all scratched and I should buy a new one.
Furthermore, now my battery doesn't charge anymore up to 100%...it's stuck at 93% and only if i unplug and plug again the phone it gets to 98%...to get 100% i have to plug and unplg it several times and wait something like 30min to get from 98% to 100%. I don't know what caused this problem but it looks like there's no solution...software and hardware battery calibration didn't do anything. Maybe the battery I bought was faulty...
In conclusion, buy the new battery but ask someone expert to replace it if you aren't.
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Click to collapse
The first replacement battery I tried acted like that and it was quite frustrating. It wouldn't charge to 100% and had about the capacity of my degraded OEM battery. I ended up ordering this one http://www.ebay.com/itm/New-3-82V-3...wei-Google-Nexus-6P-H1511-H1512-/351786248092 It charges to 100% and has like new capacity, but no internal battery temperature sensor. I installed it in January and have been happy with it. Others have opted for the Cameron Sino brand replacement. more expensive but with working battery temperature sensor.
You can order a replacement back cover with glass and bottom strip for around $25 if you're worrried about scratches. That's under $40 for new battery, aluminum back, camera glass, and bottom strip.

hawkswind1 said:
The first replacement battery I tried acted like that and it was quite frustrating. It wouldn't charge to 100% and had about the capacity of my degraded OEM battery. I ended up ordering this one http://www.ebay.com/itm/New-3-82V-3...wei-Google-Nexus-6P-H1511-H1512-/351786248092 It charges to 100% and has like new capacity, but no internal battery temperature sensor. I installed it in January and have been happy with it. Others have opted for the Cameron Sino brand replacement. more expensive but with working battery temperature sensor.
You can order a replacement back cover with glass and bottom strip for around $25 if you're worrried about scratches. That's under $40 for new battery, aluminum back, camera glass, and bottom strip.
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I think I'll go for the Cameron Sino battery...a little more expensive, yes, but more reliable...I've also heard of people complaining that after 2 months their batteries (ordered from ebay, false OEM) died...

So, is that the answer to our fast draining battery issues? To get a replacement battery? The Cameron Sino?

baldybill said:
So, is that the answer to our fast draining battery issues? To get a replacement battery? The Cameron Sino?
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Yes.

Unless it came from the play store where you can RMA it and let Google have the problem.

But if Google replaces it, it may have the same issues, right?

It could I guess if the battery in the replacement device is a dud. Just got my replacement and the battery is showing 106% capacity compared to 30% capacity on the old one. Back to how it was when I first got it so happy with that service seeing as it was nearly 2 years old.
If the new one does not have a full capacity, then just reject it before you swap over to it and get Google to send out another.

400ixl said:
It could I guess if the battery in the replacement device is a dud. Just got my replacement and the battery is showing 106% capacity compared to 30% capacity on the old one. Back to how it was when I first got it so happy with that service seeing as it was nearly 2 years old.
If the new one does not have a full capacity, then just reject it before you swap over to it and get Google to send out another.
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How are you checking the capacity?

Accubattery is one way. Do a couple of decent charges with the screen off and then look at the health report.

Same, I tried several things, clearing the Cache, factory reset and nothing works. My Nexus 6P randomly shuts down between 80% to 90% and doesn't turn on umless I connect it to the charger.

Disgraceful battery, used phone -- options?

Hi all,
Bought my 6P used a year ago to the day.
Recently, along with the ever-looming battery shutdown bug (32%), I've been struggling to even get an hour SoT, and can go for a short walk with 50% battery and come back with a dead phone.
Huawei refuse to do anything as I do not have original proof-of-purchase for the phone, so my only options are to do things myself or pay someone else.
What are my options here? Will a battery replacement resolve my issues? Replacement genuine batteries seem expensive, are cheap knockoffs to be trusted?

Here is my findings.
I reset my 6P and fully charged. Let it on without using it, it last at least 20 hours and still 59% power left. Then I took 3 photos and it shutdown right away.
I think it is the software issue. Replace battery won't fix it.

Bought my phone used through Swappa and had no proof of purchase, but was still able to convince Google to send me an RMA phone a few weeks ago. Accubattery said the old one had like 70% battery capacity, while the new one is reporting 103% now and my SOT is probably double. So maybe complain away to Google reps until they decide to just RMA it...

Hi, who did you contact for this? I can't find a link on Google's site.
Thanks

Buy a new battery form ebay for 9.99 and it comes with the tools needed to swap with the exception of a x-acto knife or heat gun, but you can use a hair dryer just make sure not to apply heat on the camera or you will have to replace it as well. Buy the one form seller 8-50855 which offers the battery with a temp sensor. The process takes about 20-30 minutes, but it makes a huge difference to have a new battery. Now I get 5-6 hours SoT with heavy usage with pure nexus and custom kernel(Francos) 103% health as well and no more shutting off at 25%.

sytzeng said:
Here is my findings.
I reset my 6P and fully charged. Let it on without using it, it last at least 20 hours and still 59% power left. Then I took 3 photos and it shutdown right away.
I think it is the software issue. Replace battery won't fix it.
Click to expand...
Click to collapse
That is a GUESS on your part, not a finding.
xxgmon3yxx said:
Buy a new battery form ebay for 9.99 and it comes with the tools needed to swap with the exception of a x-acto knife or heat gun, but you can use a hair dryer just make sure not to apply heat on the camera or you will have to replace it as well. Buy the one form seller 8-50855 which offers the battery with a temp sensor. The process takes about 20-30 minutes, but it makes a huge difference to have a new battery. Now I get 5-6 hours SoT with heavy usage with pure nexus and custom kernel(Francos) 103% health as well and no more shutting off at 25%.
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Right on! :good:

xxgmon3yxx said:
Buy a new battery form ebay for 9.99 and it comes with the tools needed to swap with the exception of a x-acto knife or heat gun, but you can use a hair dryer just make sure not to apply heat on the camera or you will have to replace it as well. Buy the one form seller 8-50855 which offers the battery with a temp sensor. The process takes about 20-30 minutes, but it makes a huge difference to have a new battery. Now I get 5-6 hours SoT with heavy usage with pure nexus and custom kernel(Francos) 103% health as well and no more shutting off at 25%.
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Unfortunately in the UK they are harder to source.
One thing that worries me is - do you need to glue the phone back together?

Quarsar said:
Unfortunately in the UK they are harder to source.
One thing that worries me is - do you need to glue the phone back together?
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they are easy to get in the uk, if you dont trust ebay, i use this company for all my spares for the nexus 6p
https://www.replacebase.co.uk/for-huawei-nexus-6p-replacement-battery-hb416683ecw-3450mah-oem/
also you dont need glue to reassemble the phone, not sure if the battery is held down but if it is, the some double sided m3 tape would do the trick.

DANIELWHITT said:
they are easy to get in the uk, if you dont trust ebay, i use this company for all my spares for the nexus 6p
https://www.replacebase.co.uk/for-huawei-nexus-6p-replacement-battery-hb416683ecw-3450mah-oem/
also you dont need glue to reassemble the phone, not sure if the battery is held down but if it is, the some double sided m3 tape would do the trick.
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Sound, pulled the trigger and ordered off ebay. Now to hope I don't break it taking it apart!

I may end up doing a battery swap also. I;ve had my 6P for 14 months and the battery is only at 65% of it's capacity. This is by far the worst performing battery I have ever had. I'm getting something like 2 hours of SOT. My LG G5, which I've owned longer, has held up MUCH better in the battery department.
I basically move it from charger to charger (car, desk, night stand). I was at an even this weekend and was sure to bring my battery pack to make sure it wouldn't run out of juice during the 8 hours I was there.
I treat my batteries well, and try to never let them discharge below 50% if possible.

I get 2 hours on a VERY good day!

Battery replaced, a little more hassle than it really should be, but let's see how this goes.

Need a replacement battery for your Nexus 7? I found one for ~$16 that doesn't suck (for now).

TL;DR at bottom. For those who like reading, continue..
I recently bought a Nexus 7 for tinkering and nostalgia reasons. I am really impressed that the tablet is STILL supported by custom ROM developers, pretty insane for a 8 year old device. However the battery life was terrible, reporting a capacity of ~56% via Accubattery. That is just poor and almost unusable in my opinion. Off I went on the Google machine searching for a genuine battery, most if not all were fake. I saw mostly photoshopped images of a generic batteries, that don't even look like the original. I did however find one listing of actual "new" genuine Asus/Panasonic batteries but they ship from China, ETA was over a month. Here is that listing for it: eBay link for ~$24. I am very impatient and decided to take a chance on this battery, shipping from California: eBay link The reason I chose this one was because I was about to purchase a battery from iFixit for $30, almost $40 including taxes and shipping. The battery in the second eBay link is the SAME battery shown on the iFixit page for less than half the cost. Insane. One of the reviews reported the battery only had around 83% capacity of 3950mAh with Accubattery, not good.
At ~$16 shipped, 83% capacity is helluva lot better than 56% and decided to go for it. The battery came well packaged along with those super flimsy small screwdriver set, adhesive stips and two plastic prying tools. Don't use the included drivers, they will strip the crap of whatever screw you try to remove. Opening the Nexus is the most tedious part of the battery replacement. I did crack the back casing where the headphone jack port is, it is not that noticable once back together. That area is the thinnest part of the casing and still cracked while being super conservative with prying. Once the back is off the rest of the battery replacement is much easier. Once everything was said and done I powered up the Nexus and the battery was charged to around 80%. And the improvement was already noticeable, the battery did not drain rapidly like the old one did. I drained the battery until it shut off, plugged in the charger and waited. And waited, and waited. It took over three hours for the Nexus to fully charge. And Accubattery reported... 90%! Granted this is just the first battery cycle but for $16 I could not be happier. I do not know if I got lucky with the battery I received but I cannot complain one bit. 90% capacity of 3950mAh! However the battery does suddenly cut off at 3%, something that the original did not do but that doesn't bother me. Draining Li-Ion batteries to 0% degrades them immensely, as well as charging them to 100%. Increase battery life (literally) by keeping the charge from 20-80%. This applies to all devices with Li-Ion batteries.
As for a long term test, we shall see. If the battery does fail prematurely I'll post an update here.
TL;DR: eBay sells the same battery for ~$16 delivered that iFixit sells for over twice the cost. The replacement battery has ~90% capacity of the advertised 3950mAh. Link for battery I bought, same as above: eBay link

perez6991 said:
...pretty insane for a 8 year old device. However the battery life was terrible...
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Thank you for the link. Another battery power solution for our almost-a-decade-old device is no-battery mod and a cheap 10Ah (or more) power bank glued to the back. In this "configuration" Nexus 7'13 can survive independently of battery supply sources

perez6991 said:
TL;DR at bottom. For those who like reading, continue..
I recently bought a Nexus 7 for tinkering and nostalgia reasons. I am really impressed that the tablet is STILL supported by custom ROM developers, pretty insane for a 8 year old device. However the battery life was terrible, reporting a capacity of ~56% via Accubattery. That is just poor and almost unusable in my opinion. Off I went on the Google machine searching for a genuine battery, most if not all were fake. I saw mostly photoshopped images of a generic batteries, that don't even look like the original. I did however find one listing of actual "new" genuine Asus/Panasonic batteries but they ship from China, ETA was over a month. Here is that listing for it: eBay link for ~$24. I am very impatient and decided to take a chance on this battery, shipping from California: eBay link The reason I chose this one was because I was about to purchase a battery from iFixit for $30, almost $40 including taxes and shipping. The battery in the second eBay link is the SAME battery shown on the iFixit page for less than half the cost. Insane. One of the reviews reported the battery only had around 83% capacity of 3950mAh with Accubattery, not good.
At ~$16 shipped, 83% capacity is helluva lot better than 56% and decided to go for it. The battery came well packaged along with those super flimsy small screwdriver set, adhesive stips and two plastic prying tools. Don't use the included drivers, they will strip the crap of whatever screw you try to remove. Opening the Nexus is the most tedious part of the battery replacement. I did crack the back casing where the headphone jack port is, it is not that noticable once back together. That area is the thinnest part of the casing and still cracked while being super conservative with prying. Once the back is off the rest of the battery replacement is much easier. Once everything was said and done I powered up the Nexus and the battery was charged to around 80%. And the improvement was already noticeable, the battery did not drain rapidly like the old one did. I drained the battery until it shut off, plugged in the charger and waited. And waited, and waited. It took over three hours for the Nexus to fully charge. And Accubattery reported... 90%! Granted this is just the first battery cycle but for $16 I could not be happier. I do not know if I got lucky with the battery I received but I cannot complain one bit. 90% capacity of 3950mAh! However the battery does suddenly cut off at 3%, something that the original did not do but that doesn't bother me. Draining Li-Ion batteries to 0% degrades them immensely, as well as charging them to 100%. Increase battery life (literally) by keeping the charge from 20-80%. This applies to all devices with Li-Ion batteries.
As for a long term test, we shall see. If the battery does fail prematurely I'll post an update here.
TL;DR: eBay sells the same battery for ~$16 delivered that iFixit sells for over twice the cost. The replacement battery has ~90% capacity of the advertised 3950mAh. Link for battery I bought, same as above: eBay link
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Hello
I just got a nexus 7 2012 version from someone for free.
It does not turn on, does not charge. I tried all sorts of things including "jump starting " the battery.
Looks like I fried the battery doing that.
THe battery reads about 3.4 volts but it should be 4.7 volts correct?
Seeing all this, do you think its worth it to purchase another battery to see if this is the problem?
I am thinking its a dead battery with a reading like that, and wont accept charge anymore.
Any idea?