Designed for use with the Stihl's cordless range. Stihl batteries come with an LED charge level indicator. The SP 100 is 36v & has a capacity of 187 Wh. Run-times will vary depending on the tool & the working conditions. Charging Time (to 100% capacity):AL 101 charger 200 mins AL 300 charger 55 mins AL 500 charger 45 mins Specification: Battery Type: Lithium-ion Battery Battery Voltage: 36 V Battery Capacity: 5.2 Ah / 151 Wh Weight: 1.3kg Warranty: 2 year