36 V, 7.2 Ah Lithium-Ion battery. The AP 300 S is a high capacity battery that powers any tool within the STIHL AP System. With an energy capacity of 281 Wh, this battery offers an impressive 25% increase in capacity compared to the AP 300, meaning this battery will consistantly power AP System tools for longer. The battery has an integrated LED charge indicator, clearly displaying as and when the battery needs charging. Compatible with the AL 101, AL 301, AL 301-4 and AL 500 charger unit.