A friend gave me a broken laptop, with no clear problem description. There was no charger, so after rummaging around in my stuff, I found an HP charger that should work. The laptop was fine, but even though it said "charging" and had s an orange LED the battery stayed in 0% ... Reinstalling, BIOS update etc. didn't help, and the only stuff on YouTube was garbage. So it either the battery or the motherboard. Let's disassemble the battery!