42Wh Lithium-ion battery for

The Dell 7CJRC is a lithium-ion laptop battery, identified in Dell documentation as model KNM09. Its 42 Wh rated capacity and 3500 mAh charge capacity describe how much electrical energy it can store, while the 11.4 V nominal voltage specifies its electrical rating. Use the 7CJRC part number to identify this particular variant when looking for a replacement.