Battery Type: Li-ion Polymer battery Capacity: 500mAh Nominal Voltage: 3.7V PaPack Dimension: 40.00 x 20.50 x 6.00 mm Weight: 10g Working Temperature: Less than 60℃(140℉) Compatible Models: Plantronic s Savi 8210, Savi W8210 Wireless Headset Compatible Battery Models: 202555-01, 211425-01 Cautions: 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℉).