HZ401020 3.7V 55mAh Lithium Polymer Pouch Cell for Bluetooth Headset Wearable Devices HZ401020 3.7V 55mAh Lithium Polymer Pouch Cell for Bluetooth Headset Wearable Devices Specifications Model HZ401020 Cell Type Lithium polymer battery Dimension 4±0.2*10±0.5*20±2.5 mm (Thickness*Width*Length) Nominal Capacity 55mAh, custom size & capacity available Nominal Voltage 3.7V Max Cut-off Voltage 4.2V Standard Discharge Current 0.2C-0.5C Max Discharge Current 1C Connector Option JST,