Chosen Solution
When I have my battery inserted correctly like this:
the phone doesn’t turn on at all. When I have it like this:
it turns on and works with no problem. I tried with a diffrent board and it does the same, is it a battery problem?
if you tried a diffrent board, why don’t try a diffrent battery ? I think it will fix your problem
Clean the battery gold points with isopropyl alcohol. Make sure it’s at least 90% alcohol. Also clean the 4 golden connection prongs on the phone as well. If that doesn’t help try another battery like @cornelis said.
