I simply cannot believe the power this battery has given to my phone.  Like so many others, I was ready to get a new phone since I had to continually charge after 2 hours.  it was driving me crazy. The battery lasts all day, and then some.  I just wish I had this months ago'  I am in the very beginning stages of using this, and hopefully this great performance will last. This comes with a 30-day warranty, so be sure to register within 30 days.  The phone, as everyone has said, is heavier.  The case is sturdy and fits well in the hand.