Battery type: Li-MnO2 Capacity: 850 mAh Voltage: 3 V Energy: 2.55 Wh Number of cells: 1 Dimensions (L x W x H): 2.7 x 1.6 x 1.6 cm Weight: 11 g Compatible with the following device models: Omron CJ2G Omron CJ2M Omron CJ1G Omron CP1H Omron CJ1M Omron CP1E Omron CP1L To ensure compatibility, please check to see whether the battery you are currently using is listed below.