Maybe made-in-china replacements are hit or miss, but this one was defective. Battery worked and was not warped, but will not recharge. This ws a bit expensive for a single use battery. Tried to return this defective product for a refund, was informed that i could only exchange it for another (likely also made-in-china and defective) product, and even that only after they test the battery i return to them. I don't need it tested to know it will not charge in my phone, whereas the now warped original battery that came with my phone will at least still charge. Defective battery-mart made-in-china battery is going in the garbage along with my money, and i will keep using my phone's original battery even though it runs out of charge after a few hours.