Ok, I know there is a battery section, but this seemed more appropriate a place to ask. I used a Sony F550 battery for my portable and I just want to be sure of something. When it is fully charged, will it stop charging, like so it won't explode? (which is what the pcb is for...) Kind of a silly question, but I just want to be 100% sure.

If you're using a smart charger, yes.