To give a more precise answer, there isn't an actual command. There isn't any way to tell the battery to discharge the electricty stored within (laptop, shoot out a bolt of lightning to annihilate my enemies!) short of simply running it until it powers down.
I know laptops tend to have battery calibration/analysis programs in the BIOS, but generally once a battery stops holding a charge, it's toast. And, unfortunately (batteries can get expensive - I've got a laptop with a dead battery that will cost me 150$ if I ever want to replace it), laptop batteries die - it's part of a laptop's lifecycle.
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Eat antimatter, Posleen-boy!
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