I bought this to replace a dying battery for an LG VX8100, which was getting about one hour of talk time at the most.This product works much better than I'd expected. During my first trial with it, the battery lasted for about 4 days, with six to seven hours of talk time.Of course, the phone is heavier with this battery, probably about 25% more than with the standard battery. The weight difference isn't that noticeable, and if it were, you'd probably be better off with a lighter phone such as a RAZR.