DDONG for Galaxy S21 Ultra Replacement Battery, Upgraded 5800mAh EB-BG998ABY Battery for Samsung Galaxy S21 Ultra 5G SM-G998B/DS SM-G998U SM-G998B with Repair Tool Kit

Fit well but I haven't had it long enough to check battery life functions well. Quality seems good.

The connector that connects to the Motherboard is smaller than the original. I can't get it to lock in place which is very frustrating. Been sitting for an hour trying to get it to lock in place but nothing is working. The original batter locks in place but this one wont.

Have had this battery installed for a year. Was not 5800 mAh as labeled. Ended up being 4855. This misleading labeling is enough to warrant one star, but I gave it 2 stars since it did fit and functioned. My issue after a year of use is battery health has dropped to 82% of design capacity, according to AccuBattery app. Seems like a significant drop in effectiveness after just a year that shouldn't have occurred. Overall, would not recommend.

Actual system data is 4855.0 mAh, other than that, it does function well and worked to replace my old damaged battery. They just shouldn't list and label it as having 100 more mAh than it actually does.

Works great! Easy to replace by myself, battery has improved now that I replaced the old one, fit perfectly! Great product over all!

Muy buena calidad del producto,gracias

Me llegó partido el conector que va al celular de la batería por lo que no puedo usarlo, fue una perdida de dinero

This product works really well