DSTE&reg; LP-E4 Replacement Li-ion Battery for Canon EOS-1D C EOS-1D Mark III IV EOS-1Ds Mark III IV Digital Camera Battery Type : Li-ion; Battery Capacity : 48.8Wh/4400mAh Note: It can't show battery level when using in Canon 1DX, 1DX MARK II, and the original charger of 1DX MARK II can't charge our battery. CE Safety Certification and UL Listed; Meets or exceeds OEM standards Info Function for Life Indication High Capacity for Stamina Long lasting. No memory effect, can be charged or dischargered at anytime. Perform as good or better than the top branded batteries on the market.