STIHL AK 20 Lithium-ion battery Compact lithium-ion battery with a capacity of 144 Wh. With charge status indicator (LED). Compatible with AL 101, AL 100, AL 300 and AL 500 chargers. TECHNICAL SPECIFICATIONS Battery weight: 1.2 kg Voltage: 36 V Energy content: 144 Wh Nominal capacity according to: IEC 61960 Ah 2.8 ORIGINAL CODE: 4520-400-6518 45204006518 CZ