These batteries are awesome! Absolutely no problems at all. It's obviously an aftermarket battery and not the original. The only difference I see between the two is the price. If you want an original battery, they always have them at the retail store for well over $20. If you have time to wait for a new battery to arrive in the mail, this is the way to go. I've been using these batteries in two different phones for over six months now. Like I said, they are awesome! If you don't want any issues out of your batteries, I suggest you let them charge for 12 hours before you use them.