I’m often asked whether laptop batteries need to be drained completely before recharging them.
My answer? Well, it depends on the type of battery that it uses.
Early laptops used nickel-cadmium (NiCad) batteries which were subject to a “memory effect”. If they weren’t allowed to discharge all the way before being recharged they would eventually “remember” the level of charge they fell to before recharging and act as if they were completely drained every time their charge decreased to that level. [Read more…]