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The ThinkPad A21e and A22e NiMH Battery is a rechargeable battery that supports new models of the ThinkPad A20m, A21e, A21m, A22e, A22p, A22m ( 2655, 2663, 2664). This battery contains six cells with a output of 10.8 V and can be recharged in as little as 2.5 to 6 hours depending on the ThinkPad system usage. Spare system batteries can be swapped in to help maximize unplugged system usage. Nickel hydride technology offers a low-cost battery alternative.