Designed for use with the STIHL's cordless range. AK 30 is 36v & has a capacity of 180 Wh. Stihl batteries come with an LED charge level indicator. Run-times will vary depending on the tool & the working conditions. Charging Time (to 100% capacity)AL 101 charger: 205 mins AL 300 charger: 60 mins AL 500 charger: 60 mins Specification: Battery Type: Lithium-ion Battery Battery Voltage: 36 V Battery Capacity: 5.2 Ah / 180 Wh Weight: 1.3kg Warranty: 2 year