A card of two Energizer MAX AA batteries. Energizer MAX alkaline batteries are general-purpose 1.5 V single-use cells for everyday devices such as torches, clocks, radios, remote controls, smoke detectors, toys and computer mice. Energizer's Power Seal technology locks the power in so the cells hold their charge in storage and the pack states up to 10 years' shelf life. The AA size (also called E91, LR6 or penlight) measures about 14.5 mm across and 50 mm long and is the most common household battery. Energizer MAX cells are made not to leak in normal use and are marked up to four times longer lasting than ordinary carbon zinc cells. Keep a spare card in the kitchen drawer, the cubby box or the camping kit.