Galaxy S21 Ultra Battery, (Upgraded) MAXBEAR 5500mAh 3.85V Li-Polymer Replacement Battery EB-BG998ABY for Samsung Galaxy S21 Ultra 5G SM-G998B/DS SM-G998U with Repair Tool Kit

This is as the picture provides it is great for the cost and it works well.

I CHARGED IT OVERNIGHT AND IT SHOWED 100% MADE 2 PHONE CALLS FOR 15 MINUTES TOTAL AT IT DRAINED TO 83% AFTER SITTING ON MY DESK FOR ABOUT 3 HOURS ON STAND BY IT DRAINED TO 73%. I ASK FOR A REPLACEMENT AND WAS GIVEN NO PROBLEMS 'ILL HAVE IT BY MONDAY. DON'T GET ME WRONG IT'S NOT THE COMPANY THAT SOLD IT TO ME IT'S JUST A FAULTY BATTERY. BUT I WILL SAY THERE CUSTOMER SERVICE IS GREAT NO PROBLEMS WHAT SO EVER. AT THIS TIME I'M STILL GIVING THEM 5 STARS. I'LL POST ANOTHER REVIEW AFTER I CHARGE THE NEW ONE. ON MONDAY. I RECEIVED MY REPLACEMENT IN 2 DAYS AND CHARGED IT OVER NIGHT AND IT WORKS GREAT.

Bought one "MAXBEAR (Upgraded) 3800mAh 3.85V Li-Polymer Battery" for my Galaxy S7. Came w/ 60% power. Used it until phone turned off. Plugged in to wall outlet w/ my original Samsung charger. Needed FOUR FULL DAYS to fully charge. AND I had to keep unplugging it and plugging it back in as it kept stopping the charge. Used phone until battery down to 5%, then it would not accept a charge at all. Tried different chargers, different outlets, but battery was dead and would no longer recharge. I traded it in for another of the same battery. Started off the same, also needed four days to charge first time, then on second charge attempt overnight, it didn't increase charge percentage at all (although the light indicated it was charging.) Unplugged from the charger and plugged in again, then after four hours the charge increased 10%. After the first battery wouldn't recharge, I emailed the seller directly with a simple outline of my problem asking for specific input and was sent an exact copy of the text used on their seller page w/ a general description of how to charge a battery. So, a typical garbage Chinese knockoff product and common Chinese dealer selling to an American market who won't bother using a translator to thoughtfully respond to their customers' genuine concerns.

Kit does include most tools to get case open and get to the point of prying old battery pack out. Case is glued shut, battery is glued down. No instructions furnished, have to find on your own. Also source sealing tape or goop to hold back on after replacement. New battery did charge, so sucess.

I can't seem to get a link to the seller to ask, but it seems to me that the kit should include a seal (or sealer) for reinstalling the rear cover. Mine did not. That leaves my phone exposed to dirt and moisture. I don't really want to return it, because the install is otherwise done and it's working, though I may resort to that. Other than that, the install was pretty easy and the battery is functioning.

For my particular phone, the capacity of the battery was 2500 mAh. Obviously, this battery does contain more power and as a heavy user of my phone for business purposes. I noticed this particular battery able to hold an excellent charge (about 9-10 hrs) without a recharge within the first week of the battery's life. As time went on, I noticed, slightly that the battery is not able to maintain such an excellent charge. At times, the battery recharges quickly and times it does not. Should you be in dire need of a new battery, this is will work well. But, considering the price I paid and the other economical options available, it does not hurt to explore other alternatives. Overall. it is good battery as I am one month in this battery. July 2019.

got the battery replaced and phone and battery are charged.

Saved me $1299.. decided to keep mybs23u, instead of buying a s26

Tengo poco tiempo pero hasta el momento todo bien. Si se nota la diferencia incluso funciona un poco mejor el celular. Tiene todo lo necesario para instalar la bateria.