good battery, but the steps to replace leave some to be desired
The original battery was only lasting about 5 minutes before needing a charge
There were problems with the tool kit - no tool provided to get one of the screws out. Secondly, as careful as I could be, and with similar success with macbooks, the iphone power button is dead after the repair. I reattached the connections several times with no improvement. So while the battery experience is now great (holds a charge much longer), I'll have to replace the iphone soon for lack of a power button.
more warnings about what can make the power button fail. more tools in the kit to handle all screws that could be there.