Battery type: Li-Ion - no memory-effect Capacity: 2040 mAh Voltage: 3.7 V Energy: 7.54 Wh Number of cells: 1 Dimensions (L x W x H): 5 x 1.8 x 1.8 cm Weight: 35 g Compatible with the following device models: Philips Norelco 7810XL Philips Norelco 8138XL Philips Norelco 8151XL Philips Norelco 8140XL Philips Norelco 8150XL To ensure compatibility, please check to see whether the battery you are currently using is listed below.