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Canon EOS 40D Guide to Digital Photography by David D. Busch

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Battery Included

Your Canon EOS 40D is a sophisticated hunk of machinery and electronics, but it needs a charged battery to function, so rejuvenating the BP-511A lithiumion battery pack furnished with the camera should be your first step. A fully charged power source should be good for approximately 1,100 shots, based on standard tests defined by the Camera & Imaging Products Association (CIPA) document DC-002. If half your pictures use the built-in flash, you can expect about 800 shots before it’s time for a recharge.

All rechargeable batteries undergo some degree of self-discharge just sitting idle in the camera or in the original packaging. Lithiumion power packs of this type typically lose a few percent of their charge every day, even when ...

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