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my jasjar is turn off when it get to 40% buttery power

my jasjar is turn off when it get to 40% buttery power , what can it be ? if i charge it it dosent turn off but without power charger it work just until 40% .
thanks in advance.

http://forum.xda-developers.com/showthread.php?p=1081974#post1081974

sometimes this is just due to topping up charges and there is not a "continuous" supply current in the battery at that 40% mark. I had it once but always top up whenever halfway or very low and never had problem, but a way to fix the glitch is to drain the battery and then fully charge it

Li-Ion batteries do not suffer from memory effect. I have read in several tech reports on Li-Ion technology that it is actually better to top up often, like a lead acid battery. If the battery goes into deep discharge conditions, this will potentially cause serious problems. Assuminb the protection circuits in the battery work, this shouldn't be an issue though.The main problem is that the cells oxidise and stop transferring the charge to the device. This starts as soon as they are made and can't be stopped. If the oxidisation between cells is bad enough, the only use you get is from cells one side of this barrier. The battery still reports charge because the other cells still have it but they can't be usedBottom line is that the battery is poor on the Uni and lasts less than a year.Get a new one from another source, Cameron Sinio or whatever they are called are usually good.

pug said:
Li-Ion batteries do not suffer from memory effect. I have read in several tech reports on Li-Ion technology that it is actually better to top up often, like a lead acid battery.
<...>
Get a new one from another source, Cameron Sinio or whatever they are called are usually good.
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Yeah I always put it into charger cradle when driving home -- nice way to keep it topped up.
Recently my battery started to play up and I have ordered one from BatteryUpgrade.com - a Cameron Sino battery for £18.xx has arrived quickly but could not serve the purpose - was not charging and eventually totally discharged.
Also was not indicating charge properly - always 100% (the LED is still Amber, not Green as you would expect at 100%).
I wonder if anyone else has bought Cameron Sino branded batteries and experienced same effects: 1) always 100% indication in your software and 2) lack of ability to charge?

Universal is using Lithium Polymer (light weight), not Lithium ion (heavy weight) batteries.

The main differences between li-ion and li-po batteries are the recharge/discharge rates and the construction of the core. Li-ion batteries are "wet" cells where as Li-Po batteries are "dry" which makes them thinner and more rugged. The same precautions still need to be observed and the life of the batteries is still about the same. They start becoming unusable after 300 charges and only have 40% of charge after 500 cycles. The life of 3 years is from the date of production, being stored at 40% charge and at the appropriate temperature. They are better when constantly topped up to prevent the voltage of the cells from dropping too low as this promotes oxidisation between the boundries of the cell. If they are overcharged, lithium metal is produced which is also bad. Another problem is that if the cell voltage drops too low it can never be recovered meaning one knackered battery. I have looked into this quite a bit as my battery has started shutting off at 60%ish, after 10 months of use which is pretty fair. I only expect batteries to last a year anyway. Good excuse to get a higher capacity battery in my opinion. I have used a Cameron Sino battery before in my Alpine and had those reporting issues for a few weeks and they dissappeared almost overnight. Don't know why but hey, isn't modern technology great?

Interesting. Thanks for you info. No wonder battery is not under gaurantee!

EastExpert said:
Yeah I always put it into charger cradle when driving home -- nice way to keep it topped up.
Recently my battery started to play up and I have ordered one from BatteryUpgrade.com - a Cameron Sino battery for £18.xx has arrived quickly but could not serve the purpose - was not charging and eventually totally discharged.
Also was not indicating charge properly - always 100% (the LED is still Amber, not Green as you would expect at 100%).
I wonder if anyone else has bought Cameron Sino branded batteries and experienced same effects: 1) always 100% indication in your software and 2) lack of ability to charge?
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Yes, I've had 3 Cameron Sino batteries that all reported 100% regardless of charge level. Can't remember if the LED ever went green with them, or not, I'm afraid. Obviously, they all went back for refund.
Cheers,
Steve.

I got a CS battery and it started to expand, cracking the casing and seeming rather dangerous. I emailed the seller and it was replaced in 24 hours. He asked for theold one sent back so the factory could analyse it.
I had to dump the replacement recently because it wasn't giving the Uni enough current to complete a hard reset and was lockingup the device during 3G data and a call.
All in all I think 2 bad ones is enough, I will stick to the one that comes with the Uni and keep a USB cable curled up in my pocket =)

Batteries, roll 'em around

Just some input about keeping the Vibe lit up and happy. I went with a battery two-pack from ebay, which of course incl the wall charger and other accy's. Mostly good reviews on these kits, which usually run around $32 or so...believe Amazon shows them as well.
I numbered these additional batts 1 and 2 for my reference, and for the most part, I don't concern myself about which of my (now three) batts is in the phone. I've been rotating them around for about 2 months now, only changing them out on the phone (when nesc. to) complete a daily session. Quite honestly, l am getting fully satisfactory performance from each of them.
If I pull a battery from the phone it goes into the wall charger, which noticeably gives a long and deep charge. I keep the charged spares arranged side-by-side on a table with the older charge to the right - both tucked away in the padded bags they came in. For a change-out, grab batt on right and replace it with (newer charge) batt to it's left. It's a simple rotation, and the spent batt goes to wall charger. Once or twice a week I'll run a cell down to zero, and a wall charger might spend 6 or 7 hours on a charge from fully spent. No battery stat wipes or other special tasks applied.
That's a good charge... I've had these 'wall charged' batts sit for a week or so and still show a true 100% after install. Maybe just lucky, but I'm all smiley with the kit, which also includes a car charger.
Not rooted, but for now I'm going with the "after ji6" advice on shutting down any Mediahub (drm,et) services on a fresh boot. Thankfully they usually don't restart too often.
Shrug - it's all good...

I've been doing the same thing with my Cliq since I got it (waiting for Vibrant in the mail ). It's great.
It was actually a huge selling point for me, and one of the various arguments I use to back up my choice of an Android phone over an iPhone, the ability to easily (and quickly) change batteries. I wanted to A) be able to "charge the phone" without ever making it difficult to use (plus I'm extremely forgetful, so I'd rather not have to plug it in every night) and B) be able to carry spares for when I'm away from the house for extended periods (or again, if I forget to charge!)
It's excellent. Totally weird, but really practical. I've already ordered a couple extra batteries and a charger for the vibrant, and I don't even have the phone yet! I just don't know how I would feel going back to plugging the phone in every day.

Batts, rotate 'em around
I agree with "excellent" and disagree with "totally wierd".
My edit, ok?
I enjoyed your reply, as it's all about learning some fun tricks with this phone. Most of what we know comes from someone else
Notes: build quality on these batts is presumably lower than the original, but I don't recall any damages reported as result of their use.
For 32 bucks I have what I need, when I need it..
Pssst ... you're gonna love the Vibrant screen.
Also, I highly rec you order a user rated gelcase thru the usual channels. Hardcases are awesome, if you don't need to access the batt.
The stock Vibrant is a slippery Eel, Imo.
My current is $4.95 (don't quote me) thereabouts thru amazon - that's delivered. Smoke colored gelcase from Hong Kong and it took about 18 days transit. Most importantly, read the user comments before buying. Look for mentions of good fit, et.

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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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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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.

Won't turn on, no lights, but warms up when plugged in.

As the title says, Phone won't turn on. There are no led lights at all. It does get warm after being plugged in for a little. I had jrkruse's hybrid_bra1 stock safetynet samsungpay...... rom on it. It was rooted. Very minimal processes running. I actually had basically everything stopped and greenify on. Phone was around 40% battery. I plugged it into charger, took my dog outside, showered real fast, washed a few dishes, then came back in to room within 15 minutes to my phone being dead and hot. It's never got this hot before even while rooted and plugged in with this rom on it. I have never had it get that hot. Was just formatted the day before and really bare but, that is what happened.
A couple battery apps I had put the batteries remaining life capacity at around 60%. It held a charge poorly. Even for 60% capacity it felt weak, considering how little I did on it lately. I am thinking the battery may have took a crap but unsure because it warms up when it is plugged in. I plan on getting a battery soon since they are inexpensive and replace it to try it out.
Just wondering if anyone here has any experience with this and can offer any advice.
Thank you in advance.
(I looked for a min or two for similar posts but didn't find much. Will gladly take down if someone can point me the way)

You say your battery was already outworn, It may have died. I think you should try with a new battery, Or take it to a technician who can test the phone's hardware to see if there is anything else broken
i've only had one similar case with an s3, which would turn of at random % of battery. But when plugged turned on. I replaced the battery and it worked fine then

Maxissc said:
You say your battery was already outworn, It may have died. I think you should try with a new battery, Or take it to a technician who can test the phone's hardware to see if there is anything else broken
i've only had one similar case with an s3, which would turn of at random % of battery. But when plugged turned on. I replaced the battery and it worked fine then
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I really do hope that is what's wrong. I just ordered a battery. Thanks for the reply. I also got some little tools and battery door adhesive sticker. Wish me luck!
funny story....
The mic in my Nubia Red Magic broke and I sent that back to hong kong for repairs like 20 days ago. Before the Red Magic, I used this galaxy s7 edge my friend gave me. I gave it back when I got the Red Magic and told him to sell it or something. Not much later, decided to buy it back off of him for $200 to give to my mother. She loved it. I had the gs7 edge with me exploring prepaid provider options for my mom when the Red Magic mic broke. So then I decided to borrow the edge from her till my phone got back and few days later I break this one too..
I feel naked without a phone for so long haha

Zombiebeaver said:
As the title says, Phone won't turn on. There are no led lights at all. It does get warm after being plugged in for a little. I had jrkruse's hybrid_bra1 stock safetynet samsungpay...... rom on it. It was rooted. Very minimal processes running. I actually had basically everything stopped and greenify on. Phone was around 40% battery. I plugged it into charger, took my dog outside, showered real fast, washed a few dishes, then came back in to room within 15 minutes to my phone being dead and hot. It's never got this hot before even while rooted and plugged in with this rom on it. I have never had it get that hot. Was just formatted the day before and really bare but, that is what happened.
A couple battery apps I had put the batteries remaining life capacity at around 60%. It held a charge poorly. Even for 60% capacity it felt weak, considering how little I did on it lately. I am thinking the battery may have took a crap but unsure because it warms up when it is plugged in. I plan on getting a battery soon since they are inexpensive and replace it to try it out.
Just wondering if anyone here has any experience with this and can offer any advice.
Thank you in advance.
(I looked for a min or two for similar posts but didn't find much. Will gladly take down if someone can point me the way)
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I have the same rom, with charging issues. I don't think its the rom causing it. The s7e are getting old and the batteries are taking a toll with the age. My phone will charge up to 81 at night and stay there. I get better results with wireless charging so i just top my phone off during the day with my wireless charger. There is a code to reset the battery's internal memory, if i find the link on how to do it I will post here for you.

Fear_The_Fluff said:
I have the same rom, with charging issues. I don't think its the rom causing it. The s7e are getting old and the batteries are taking a toll with the age. My phone will charge up to 81 at night and stay there. I get better results with wireless charging so i just top my phone off during the day with my wireless charger. There is a code to reset the battery's internal memory, if i find the link on how to do it I will post here for you.
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Thanks for reply and alright let me know if you find out. My phone had no problem charging to 100% Its just the 100% on the status bar wasnt 100% of the 3600 capacity from wear. My friend's also does the same thing as yours except his he cant charge more than like 24% haha. He just uses it as a plugged in music player in car.... I am getting battery in the mail tomorrow and will see what I can do.

Zombiebeaver said:
Thanks for reply and alright let me know if you find out. My phone had no problem charging to 100% Its just the 100% on the status bar wasnt 100% of the 3600 capacity from wear. My friend's also does the same thing as yours except his he cant charge more than like 24% haha. He just uses it as a plugged in music player in car.... I am getting battery in the mail tomorrow and will see what I can do.
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Try this: https://forum.xda-developers.com/showpost.php?p=74268596&postcount=4
I have not done it because it requires draining the battery and I never get around to doing that. Hopefully it will help you out. Good luck!

Fear_The_Fluff said:
Try this: https://forum.xda-developers.com/showpost.php?p=74268596&postcount=4
I have not done it because it requires draining the battery and I never get around to doing that. Hopefully it will help you out. Good luck!
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A little late, sorry. lol.
Thanks for suggestion, however, I may have worded my statement incorrectly. I meant to say that My phone would charge to 100% and the status bar displayed it as 100% but, the health and total capacity of the battery in mah was not the maximum 3600 or so due to simple wear and tare. It isn't apparent within any stock android feature however, battery monitoring apps like accubattery gather statistics after several charging sessions and estimate the current mah capacity. Mine was much lower than the default oem stated value of 3600. So my battery could be charged 100% but the 100% is really only 2400 mah lol. It was obvious either way by noticing that after my time using it and the previous owner's bad charging over night habits, that the battery was gradually needing charged more often lol..
I did read about the calibration method before when I was first looking into the battery issues. It seems it is more often done after a new battery is installed.
I screwed up a new battery install at the last second. I had to stop due the tiniest little round metal piece coming off from a very light swipe of my plastic spudger.
It was a very small wire connector piece. Unbelievably irritating. I didn't even finish because I doubt it would work properly. I beleive it is for the rf cable or something not sure. The red one on the left bottom side of the logicboard/motherboard whatever. There are three of them.
I took it apart and put it together a couple times prior to this and in a hurry it popped off and I couldnt find it. I couldnt find out the exact part name online so I could buy one and solder it back on. I did find a site/ supplier that has a plethora of them though. They are tiny coaxial connectors/pins. I didn't look through them all but there are 6,000 some listed under coaxial connectors (RF). https://www.digikey.com/products/en/connectors-interconnects/coaxial-connectors-rf/437?k=coaxial pin
I haven't gotten around to asking samsung or the digikeys support if they could help me find out which it is. They have different sizes and frequency ratings or speeds and such. The phone is packed away until I manage to figure out which pin to buy or if I pull 80$ or so out of my behind and buy a whole new motherboard logic board haha.

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?