Battery Type: Li-ion Polymer battery Capacity: 750mAh Nominal Voltage: 3.7V Pack Dimension: 5.0 x 30.5 x 50.0mm Weight: 10g Working Temperature: Less than 60℃(140℉) Compatible Models: Son y MDR-DS6500, MDR-XB950BT Wireless HeadsetCautions: 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℉).