i didn't know its li-po battery. hmmm does it really make a difference? shouldn't the phone have built in circuits to control the flow of current into the phone? regardless of the battery type? if the phone cannot stay plugged in overnight, its bad... i do that all the time... lol
Most likely I got a lemon set. My phone is not rooted and I have not fully switch over yet. Only whatsapp, stock quote and a lock app.
For charging, I believe the battery charging circuit is on the phone main board. We just supply 5v in for the juice.