5 - 30 Minuten
Battery lost charge over night & didn't get through a day anymore. Sometimes the battery would only charge to 98% even after waiting for a couple of hours.
The repair was pretty easy. I accidentally disconnected the lower Antenna cable which is right next to the battery connector and that gave me some/a lot of connection issues. I thought I was a problem with degreasing and after that didn't work I was almost ready to get a new phone.
Now everything works smoothly. The battery and I have noticed that it charges a lot faster?! The battery now hold through a day again and there is almost no discharge over night.
Use single-use gloves for the repair so that in the end you don't have to clean anything.
Pay real good attention that you don't loosen anything else.
Read the logic board disassembly to get an Idea of what is around the battery.