Model Number: sybs-31 Key Specifications/Special Features: 3.7V 400mAh Lithium polymer Lithium-ion rechargeable Battery for Reading PenSpecificationNominalVoltage:3.7VCapacity:400mahSize :2.8*36*48mmMaxChargeProtectionVoltage:4.2VCut-offDischargeVoltage:3.0VChargingCurrent:0.2CChargeMethod:CC-CVMaxDischargeCurrent:2CCyclelife :500timesWarranty:1yearWorkingTemperature:Charge:0~45°C,45~85%RH Dis-charge:-20~60°C,45~85%RHStorageTemperature:-20~60°C,45~85%RH,Onemonth -20~45°C,45~85%RH,Threemonths
-20~25°C,45~85%RH,Oneyear