Battery for LG D820, D821/Google Nexus 5 16Gb/Bl-T9 (2450mah/9.31Wh - Li-Polymer)

It is not an LG genuine battery, and is made by a German company called PolarCell, who kindly contacted me with an invoice shortly after I brought the battery. This reassured me that I had a real company to contact in case of malfunction, as I am sure the horror stories of fake and poorly-made batteries coupled with the famous short battery duration and shelf life of the Nexus 5 and lithium-ion batteries respectively have worried many looking for a new battery, myself included. This is not helped by the fact that LG no longer manufacture new batteries in the required specification for the Nexus 5.This review will be somewhat long and in-depth as third party batteries can be really dangerous or even fatal and I want to present this product as clearly as I can in light of this.I do not have any pictures to put up as I wanted to wait until I used this product to review it. It arrives in a relatively well-packed, large box inside which it is shrink-wrapped in a much smaller box.I have had it in my Google Nexus 5 for a few days now, and it is working just as well as the old battery used to before it stopped holding its charge. It had a trial by fire on its first full day, where I put my trust in the battery and attended Reading festival, and it held out fine. It holds its charge as well as the original battery, and so far has been safe charging while the phone has been in use. Most recent phones have circuity to prevent battery malfunction like this, but rely on a properly made battery to ensure safety. This one seems to be safe so far. I have no way to tell whether the battery has a thermistor or some type of thermal sensor on it, but it does seem to work safely.The procedure of replacing the battery itself was relatively painless, but if you do not know what you are doing I would strongly suggest you talk to a professional mobile repair service or at least extensively research the process and ensure you have the correct tools before attempting it. Lithium-ion batteries can easily become dangerous if mishandled, and you can also easily damage your Nexus 5 as it was not designed for user service.The battery itself had the appropriate connection and voltage/current and seems to be properly made. I am not sure if it really has a 2450mAh, which would be a small improvement over the stock battery, but I have not noticed any major improvement in battery life compared to my Nexus' stock battery before it began to deteriorate.The plastic wrapping around it is a little loose, which can make the battery appear smaller than the slot inside the phone for it. However, if you gently push the wrapping to fill the empty space it should fit fine.After fitting the battery I proceeded to calibrate it by charging to 100% in the phone's charge mode once installed, allowing it to trickle charge (leaving it charging after reaching 100%) for a short while, then discharging the battery fully through normal use before recharging normally. While this isn't always thought to be necessary, this is something I like to do with my replacement batteries.I will update this review in a month or so, letting you know whether the battery is still working or has had issued, but as I have said, it seems safe and functional up to this point.I hope this has helped to answer any questions or settle any fears you had about this battery. I am happy to answer questions as best I can, and I am not affiliated with PolarCell in any way.[EDIT] So it is about five months on, and the battery is still working relatively well. My phone is fine, and there have been no major problems. Although, it isn't holding its charge as well as it used to, and I fear it may be creeping towards the same problem that the original developed which caused me to buy this replacement in the first place. However, it should be noted that I have a horrible habit of using the phone while it is charging, which isn't good for the battery, and I don't tend to let it run flat as much as I should, though I do make sure to turn it off at least once a day. These habits probably did more to cause both of these problems than any battery quality issue ever could. I'll update again if the battery becomes unusable and/or I decide to replace it, but for now things are still going well.

Initially had quite a short time between charges, but has since improved. Now gives decent battery life, but the improvement over a stock battery is likely minimal.

My Nexus 5 is over 4 years old now, and the battery life was getting unbearable - having to charge it a few times a day. I considered upgrading but didn't find a phone I wanted to upgrade to since my Nexus 5 does all the things I need a phone to. I decided to have a got a replacing the battery myself, and after watching some videos decided to have a go. I bought some tools to help open the phone (also on Amazon) and after looking at the different batteries decided to go with this one (as far as I can tell, LG doesn't sell their batteries on Amazon, so the batteries on offer appear to be knock offs).Swapping the battery wasn't difficult - I watched some videos on YouTube and dusted my phone because it had collected a fair amount of dust over the years and swapped the batteries over. The trickiest part is prising the battery out since it is stuck in with adhesive padding. One issue to be aware of is to not bend the contact too much since I've seen some reports of people cracking the ribbon of replacement batteries while installing them (not this specific model, but be careful) - I found connecting the ribbon and then putting the battery in place was easier.The battery is a bit thinner than the original, and once you put the case back together it's slightly noticeable that the phone is a bit thinner where the battery is, but this isn't an issue. What's important is my phone is usable again, and I now only have to charge is every day or so like I first did when I bought the phone.So far I've been using the replacement battery for a couple weeks with no issue. Now I can carry on using my Nexus 5 until it breaks or there is a phone I feel is worth upgrading to!

This review is specifically for this one battery, not the Polarcell company.A few months ago I bought a Polarcell battery for my Nexus 6. It's really excellent, leaving me regularly with around 50% charge by the evening. Based on this experience I bought one for my Nexus 5.Unfortunately I've had the same experience as at least one other buyer who found that it simply would not charge. I left my phone plugged in for two hours. All the time the solid battery icon came and went - I interpreted this (based on past experience with other phones) as the battery being full; in any case two hours is more than enough to have at least sufficient charge to boot the phone. Nonetheless the phone refused to boot. It showed the "Google" splash for a second and then reverted to the battery icon.After many attempts and a fair amount of time I gave up and replaced the old battery. The phone immediately booted without problems.Amazon were, as usual, helpful and quick to refund my payment.It seems that Polarcell may have quality control problems. Most batteries (including my Nexus 6 one) seem to be great, but there appear to be rogue ones, so I'm reluctant to try purchasing another one when there are many others on Amazon for a third of the price.As per the title, I'm sadly disappointed.

After having my phone for 3 years my original battery only held 1200mAh (instead of 2300mAh) meaning I had to charge it 2 or 3 times a day. I bought a replacement battery that said it was a genuine LG battery (I have my doubts) but it wasn't much better as it only held 1500mAh despite what it said it should. I asked for a replacement but that was the same.I then saw this battery and liked the idea that it wasn't pretending to be a genuine LG battery and after reading positive reviews elsewhere on the internet for Polarcell decided to give it a go. I've had it for a week now and it holds charge really well, I no longer have to charge my phone half way though the day. It is a bit soon to give an accurate reading for the capacity but it looks to be around 2400mAh.