Battery Type: Li-ion Polymer battery Capacity: 500mAh Nominal Voltage: 3.7V Pack Dimension: 6.0 x 25.0 x 37.0mmWeight: 10g Working Temperature: Less than 60 Degree C(140 Degree F) Compatible Models: Sena SMH5, SMH5-FM Compatible Battery Part Number: Sena ICP40/25/40P 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 Degree C(140 Degree F).