20 - 30 Minuten
The battery life was very poor, and the phone was constantly restarting itself. I was hoping that a new battery would fix this.
The repair was pretty straightforward, just follow the guide. Beware that the “Do not remove” sticker is designed to break into small pieces when you try to remove it. It took me some time to remove it completely, and there was no chance of re-applying it.
The battery time is obviously improved, but the phone is still rebooting itself.
The screwdriver that comes in the battery package was somehow feeling to fit the screws better than the driver from the Home Tech Toolkit. And the suction cup was indispensable. I could never have opened the phone without it.