Battery type: Li-Ion - no memory-effect Capacity: 1100 mAh Voltage: 3.7 V Energy: 4.07 Wh Number of cells: 1 Dimensions (L x W x H): 4.2 x 3.5 x 0.9 cm Weight: 26 g Compatible with the following device models: TomTom One Regional V2/V3 TomTom One Regional V3 TomTom One Regional TomTom One Regional V2 To ensure compatibility, please check to see whether the battery you are currently using is listed below.