Hahnel Digital Still Battery LP-E6 Twin Pack for Canon

The Hahnel HL-E6 Lithium-ion rechargeable battery pack is an independent alternative to the Canon LP-E6 / LP-E6N battery as used in the Canon EOS 5D Mark 2, EOS 5D Mark 3, EOS 60D, EOS 7D, and EOS 7D Mark 2 digital SLR cameras. 1650mAh 11.9Wh 7.2V capacity. Lithium-ion technology so there is no memory effect, you can recharge it at any point without having to discharge it first.