For battery and installation:
The tool provided is not enough for a battery change, more even. The magnetic screwdriver from liability was already gone at the 3rd screw, which manifested itself in the assembly. Therefore took a few attempts to bring the screws back into place. A plastic lever has adopted itself as I wanted to cut short the battery, because I had seen the clip on the iPhone too late. :)
On the whole, I can only recommend the battery incl. Tool.
As for the battery life I can logically nothing to report ---> Update comes. :)