Battery Type: Li-ion Polymer battery Capacity: 400mAh Nominal Voltage: 3.7V Pack Dimension: 30.00 x 25.50 x 6.50mm Weight: 10g Working Temperature: Less than 60?(140?) Compatible Models: Logitec h H800 H820e Wireless headset 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?).