S21 Battery Replacement Kits Compatible with Samsung Galaxy S21 SM-G991U All Models with Adhesive, Installation Manual and Repair Tool Kits

I purchased this kit to replace my wife's Samsung S21 battery. The new battery works great and is very affordable. You will want to ensure that this battery is compatible with your phone's model. Everything you will need is in this tool kit. Except for a heat source like a hair dryer or heat gun.I would say anyone with moderate electronic repair skills can easily replace their phone battery. The tricky part is getting the back cover off of the phone. Applying a little heat and using the provided tools will easily open the back of your phone.Once the phone is opened up the repair is very simple from here on. There are many guides online that will walk you through the process. You will have to apply some more heat to the front of the phone to release the battery adhesive so you can remove the old battery. Be very careful not to puncture your old battery during removal.After the new battery is in place, the next most daunting step is applying the back cover's adhesive correctly. If you pinch or break the new adhesive, you will compromise your phone's water resistance.But all in all this is a simple battery replacement that will take you around 30 minutes.If you aren't confident in your repair skills, it would help to watch a few repair videos online. Then you can see first hand that this repair isn't as intimidating as it seems.

My original Note 10+ battery swelled up and died 3 years after I got the phone. Needed a replacement and I saw this brand didn't overstate the battery capacity nor try and state that the aftermarket would be better than the OEM. No aftermarket standard sized batteries perform better than the OEM installed when you first get your phone. So I gave them the benefit of the doubt and bought one.Installed the battery without issue using a YouTube instruction video. The "guide" that they include in the box is for the Samsung S20, and states you should use it as a "general reference" and try to find your specific phone model online. So if you're expecting a written photo guide to remove the Note 10+ case to access the battery; you'll be out of luck.The tools included did their job, but nothing special outside of the screwdriver. The silver screwdriver is actually well made and I saved it in my toolbox for future projects. Everything else is practically singular use and purpose, but they get the job done. Just essentially a bunch of plastic shims and a prying bar.Battery came 18% charged. I drained it to 5%, charged it to full, and repeated the process 3 times since I've installed it. No issues so far and seems as good as my original battery. I will update this review as time goes on to see if the battery holds out. All in all, no real complaints. Everything advertised is what I got (minus the written guide) and it works.

The kit came complete with pretty much everything you need to replace the battery. Some of the instructions were pretty sparse but iFixIt has a nice walkthrough (use 90+% isopropyl alcohol and a lot of patience to soften the adhesive on the OEM battery - it's glued in there really well.Installation was straightfoward enough if you follow the iFixIt guide or similar. There will always be challenges "breaking" OEM glues, and the Note 20 is no exception.The actual battery was fine, but ... not the capacity promised for sure. After multiple calibration cycles I'm seeing an estimated battery health of 85% (3,554 mAh as compared to a stated 4,170 mAh capacity). Having said that, if you are replacing the battery in your phone chances are 85% would be a drastic improvement, and at least it discharges smoothly down to 0% with no voltage drops or "sudden death" at 20% or anything - it's an apparently healthy battery that just lacks the full stated capacity.For $20 I got a working battery for an older phone and a nice screwdriver, spudger, and picks. I would have liked to see the stated capacity, but it's made my phone at least reliable again.If you really need OEM battery capacity out of your replacement battery, this is not the one for you. If you are looking to get another year or two out of a trusty old phone, this one is okay.

The battery in my S21 had puffed up to the point that it popped the back plate off all on its own, so it was definitely time to replace the battery. The kit includes almost everything you need, including screwdriver, triangle picks, spudger, etc. You will need your own heat source to soften the adhesive on the back plate and battery itself though. Hair dryer, heat gun, etc.. I used a halogen lamp 3 inches away and that did the trick.The instructions were written for an S20, so you will probably need to think on your feet a bit unless you have that exact same model. For instance the instructions stated I needed to remove the speaker assembly, but on the S21 I did not. Just 5 screws and some ribbon cables to pop off the charging coil, heat up the phone, pry the battery out. Pop the new one in, fit all the ribbon cables back together, put the back plate back on. Phone started right up, good as new. I left it on the nightstand at 100% when I went to bed, and it was at 91% when I woke up in the morning, so battery life seems to be about right. On par with what I'd expect from a new battery.