Battery Type: Li-ion Polymer battery Capacity: 300mAh Nominal Voltage: 3.7V Pack Dimension: 6.0 x 17.5 x 32.0mm Weight: 10g Working Temperature: Less than 60℃(140℉)Compatible Models: Sony WF-H800 WF-XB700 WF-C500 TWS Earbuds Wireless Bluetooth Earphones Charging CaseCautions: 1. DO NOT ATTEMPT OPEN, DISASSEMBLE THE BATTERY. 2. DO NOT CRUSH, PUNCTURE OR DISPOSE OF IN FIRE OR WATER. 3. DO NOT EXPOSE TO ABOVE 60℃(140℉).