Advantage: Uses the highest quality Ni-MH cells, excellent performance. Overcharge and overdischarge protection to increase the life of the battery. No memory effect, can be charged or discharged as needed without loss of capacity. Low self-discharge for maximum productivity and less downtime. Specifications: Voltage: 7.2V Capacity: 4000mAh Battery Type: Ni-MH Replacement Part: Dewalt DE9057, DE9085, DW9057 Compatible Models: Dewalt: DW920, DW920K, DW920K-2, DW920K2, DW925, DW925K, DW925K-2, DW925K2, DW968, DW968K.