The Canon BP-511A Battery Pack is a Lithium-Ion battery - as maintenance-free as the current crop of digital camera batteries get.
My advice is to have at least two BP-511A batteriess (4 if you are using battery grips).
Keep one (or a set) in the camera,
keep the other(s) fully charged in your bag or pocket - ready for immediate use.
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Get your Canon BP-511A Battery Pack now from:
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Rent the Canon BP-511A Battery Pack
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