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Dear Adam,
Depending on your camera, you may be able to purchase a DC operated battery charger for your batteries.
Canon makes a nice one for their BP-NNN batteries. This would be more efficient than using an inverter to power a 110 V powered battery charger.
Of course, efficiency is not a big concern in most cases. But, if you have a battery that is going to be on the charger for hours and you car will not be running, efficiency can be a concern.
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Dan Keaton
Augusta Georgia
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