... . 2.18650 cells 3.1 year warranty 4.Size:38mm*19mm*67mm 5.5-7 days after confirm order 7.4V 2200mAh li ion battery packRechargeable battery pack ... protection Advantages:1, High energy density2, High working voltage for single battery cells3, Pollution-free4, Long cycle life5, No memory effect6, Capacity, resistance, Voltage, platform ...