Newmowa LP-E4 Rechargeable Li-ion Battery for Canon EOS-1D Mark III 1Ds Mark III 1D Mark4 Camera 1 Rechargeable Li-ion polymer battery for Canon LP-E4(Charger is not included) Rated at 11.1V and 4400mAh for a longer run time than the original Li-ion Polymer cells for longer battery life with no memory effect Fully compatible with the Canon camera All items include a 2-year manufacturer warranty