Battery type: Li-Ion - no memory-effect Capacity: 1300 mAh Voltage: 3.7 V Energy: 4.81 Wh Number of cells: 1 Weight: 25 g Compatible with the following device models: Siemens M35 Siemens M35i Siemens S35 Siemens S35i Siemens C35 Siemens C35i To ensure compatibility, please check to see whether the battery you are currently using is listed below.