... 1, High energy density 2, High working voltage for single battery cells 3, Pollution-free 4, Long cycle life Product DescriptionBattery Quality: 1 ... and higher energy density than any rechargeable battery 3, Installed IC chip will prevent the battery pack from over charge and over discharge ... 0.5C CC(constant current)charge to 4.2V, then CV(constant voltage 4.2V)charge till charge current decline to ≤ 0 ...