text: does using a laptop on ac power with charged battery inside laptop cause any damage to battery or laptop? i use a hp compaq v 3018 tu laptop. is the criteria same for all computers? no. the laptops has a auto cut off when the batteries are 100% charged. so no damage to batteries or laptop when they are charged and running at ac power. but u can do occassional tests to check battery power by working on battery for some time..