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The Canon Battery Pack BP-300 is an optional, external battery pack dedicated to both the Canon EOS 30 and EOS 33 models (EOS Elan 7E and Elan 7). The BP-300 enables the camera to be powered by widely available AA-size batteries instead of the two CR123A (or DL 123A) lithium batteries used for these models. The BP-300 can use four AA-size alkaline, Ni-Cd or nickel-hydride batteries.