Compatible Models: Logitec h H800 H820e Wireless headset 100% Compatible with original battery; 180 days warranty Capacity: 400mAh; Nominal Voltage: 3.7V Battery Type: Li-ion Polymer battery; Safe and reliable battery certified by UL, CE, UN38.3, RoHS Over 300 times cycle life; Long working time 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?).