​This charger is designed to charge Li-ion rechargeable battery packs, or Ni-MH batteries.  It is compatible with most 3.6V & 7.4V digital camera, camcorder & mobile phone Li-ion battery packs, and AA/AAA rechargeable batteries. This charger has a built-in 2600 mAh li-ion battery for charging your batteries when you don't have any power outlets nearby.