LONG LIFE: At 3600 mAh, our lithium-ion LP-E19 rechargeable battery has a 33% higher capacity than the standard Canon version, 10.8V, 3600 mAh, 38.9Wh RELIABLE: You can count on our durable replacement batteries to reliably perform as well, or better than the original or competitors' replacement batteries. COMPATIBILITY: The LP-E19 battery is compatible with Canon EOS-1D X Mark III, EOS-1D X Mark II, EOS-1D X, EOS-1Ds Mark III, EOS-1D Mark IV, and EOS-1D Mark III NOTE: LC-E19 batteries should only be charged using a LC-E19 charger