18650 li-ion battery 1).factory price, fast delivery 2) Stable,safe and reliable 3) Good consistency 4) Long life cycle 3.7v 2200mAh Lithium Battery packsingle 18650 battery capaciy have:1800mah 2000mah 2200mah 2600mah 3000mahAdvantages:1, High energy density2, High working voltage for single battery cells pollution-free 3, Long cycle life 4, No memory effect 5, Capacity, resistance, voltage, ...