Cell type Lithium polymer battery Type BYT751818-220mAh Condition 100% new Charge Voltage 4.2V Normal Capacity 220mAh Charging Temperature 0°C to 45°C Discharging Temperature -20°C to 60°C Storage Temperature -20°C to 45°C (within 1 month) Storage Temperature -20°C to 40°C(within 3 months) Storage Temperature -20°C to 35°C(within 6 months) Size T3.0±0.2*W23±0.5*L23±0.5mm Warranty 1 year Voltage range 2.75 to 4.2V Charging time According to your charger\\\\\\\'s current Cycle Time More than 500 times Certifications CE, UL, RoHS, ISO 9001, ISO 14001, FCC, MSDS