Built With Nos of High Powerful 4000-mAh Inside, Approx 40Amp Discharge Power HHiMXPO Replacement Li-Ion Battery Output 21.6V 3.9-4.0Ah Capacity Gives Extended Working Time (Not 5Ah Capacity) HHiMXPO Replacement Li-Ion Battery Compatible With Hilti B22 18V 21.6V 22V Cordless Tools And C4/36 Li-Ion Chargers This Battery Do Not Compatible With NuronSeries Tools Or Chargers, Not 12V Or 36V Tools Please Stop And Charge The Battery When Low Power, Do Not Pull Out Battery While Is Charging Do Not Water In, Do Not Keep The Battery In Wet, Standard Working Temp -10℃ ~ 50℃ LED Fuel Gauge, Compact Size (LxWxH) 5.35 x 3.8 x 2.35 In, Single Battery Approx 1.45lb HHiMXPO 2 Pack 22V Replacement Lithium-Ion Battery Compatible With Hilti B22 21.6V 22V Cordless Power Tools; Output 21.6V 3.9-4.0Ah Capacity Gives Extended Running Time At Jobsite (Not 5Ah Capacity); May Need Some Strength To Pull Out Battery At First Few Use Due To New Battery, Do Not Worry