Keeping the laptop's battery at 100% charge on laptops will shorten its lifespan considerably and they won't find out whether the battery has gone bad until the

Keeping the laptop's battery at 100% charge on laptops will shorten its lifespan considerably and they won't find out whether the battery has gone bad until the power goes out. Some newer laptops have charge limiting that can mitigate this but a secondhand laptop likely won't.