... li-ion battery 2200mah 3.7v 1.100%safe 2,Long lifespan 3.High discharge rate capacity 18650 li-ion battery 2200mah3. ... 7vAdvantages:1, High energy density2, High working voltage for single battery cells3, Pollution-free4, Long cycle life5, No memory effect6, ... connectors are available4, We could design and produce the battery pack with plastic shell and assembly procession for customized configurations ...