Brand Name: ALF Supply Ability: 300,000pcs/month MInium order: 1000pcs Delivery lead: 20day Certification: UL/CE Specifications: 1,Nominal votage:3.7v 2;Charge votage:4.2v 3;Charge to 4.2V at constant current 0.5C, then constant voltage charge to taper current 0.05C 4; Discharge to 3.0V at constant current 0.5C 5; Discharge cut-off votage: 2.75v/cell 6: Cycle Life; Residual capacity≥80% after 500 cycles vs. Discharge capacity of first cycle 7: temperature: Storage temperature-30°C---+70°C Work temperature -20°C---+60°C