Battery type: Li-polymer Capacity: 240 mAh Voltage: 3.7 V Energy: 0.89 Wh Dimensions (L x W x H): 3.9 x 2.2 x 0.5 cm Number of cells: 1 Weight: 6 g Compatible with the following device models: Bose QuietComfort QC-20 Bose QuietComfort 20 Bose QuietComfort QC20 To ensure compatibility, please check to see whether the battery you are currently using is listed below. Replacement for: Bose PR-452035 Mio 338040000101 Mio 402035 (1ICP5/21/36) .