Battery Type: Li-ion Polymer battery Capacity: 800mAh Nominal Voltage: 3.7V Pack Dimension: 50.00 x 17.00 x 14.00 mm Weight: 25g Working Temperature: Less than 60℃(140℉)Compatible Models: Sony WF-1000XM3 WF-SP900 Charging Case Compatible Battery Part Number: 1588-0911Cautions: 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℉).