Battery type: Li-polymer Capacity: 900 mAh Voltage: 7.4 V Energy: 6.66 Wh Number of cells: 2 Weight: 37 g Dimensions (L x W x H): 5.2 x 5.2 x 1.1 cm Compatible with the following device models: Bang & Olufsen BeoPlay P2 To ensure compatibility, please check to see whether the battery you are currently using is listed below. Replacement for: Bang & Olufsen C129D2 .