STIHL AK10 LITHIUM-ION BATTERY TECHNICAL DATA POWER: 72 Wh VOLTAGE: 36 V CAPACITY: 2.1 Ah WITH 4 LED RECHARGE STATUS INDICATOR COMPATIBLE WITH PRODUCTS: FSA 56, BGA 56, HSA 56 COMPATIBLE WITH CHARGERS AL 100, AL 101, AL 300 AND AL 500 OPERATING TIME VARIABLE ACCORDING TO TYPE OF EQUIPMENT CODE: 4520-400-6530