Wolfpack Li-Ion replacement battery - Capacity: 4.0 Ah. -Voltage: 20 volts - Compatible with the following items: 07021575 20 v screwdriver drill. With 2 speeds and striker. Battery 2ah. Tightening torque 35 nm. 07021580 Drill driver 20 v. With 2 speeds and striker. Battery 2ah. Tightening torque 50 nm. For 20V WOLFPACK electroportables