AGDA High Power Tools Battery for DEWALT DCD790D2 DCD795 DCD980L2 DCD980M2 DCD985 DCD985B DCD985L2 DCD985M2DCD995 DCF620 DCF880 DCF880C1-JP DCF880HL2 DCF880HM2 { Li-ion&nbsp;18V 4Ah/72Wh} Battery Type:Lithium Ion Voltage: 18V Capacity: 4000mAh Color: Black The lithium battery is the best performance of the battery. Compared with the same size of the Ni-Cd and Ni-MH,it has the largest power reserves,the lightest weight,the longest life,and the shortest charging time, whats more,no memory effect.But it is the most expensive and has requirement for AC chargers. Keep the Power Tool Battery Clean - It's a good idea to clean dirty battery contacts with a cotton swab and alcohol. This helps maintain a good connection between the battery and the portable device. Exercise the Battery - Do not leave the battery dormant for long periods of time. We recommend using the battery at least once every two to three weeks. If a Power Tool Battery has not been used for a long period of time, perform the new battery break in procedure described above. Battery Storage - If you don't plan on using the Power Tool Battery for a month or more, store it in a clean, dry, cool place away from heat and metal objects. Ni-Cd, Ni-MH and Li-ion batteries will self-discharge during storage; remember to recharge the batteries before use.