@thomasfuchs this was from the era of removable batteries, you could buy extra battery packs and swap them while the laptop was asleep, there is a capacitor or something which keeps the ram alive while you swap batteries, to extend runtime, so the spicy battery has long since been removed. I do need to get all the old batteries out of the house though, they are stored in a way to minimize fire risk, but the best would be to not have them at all 8-)