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The only thing I've seen is Canon's ACK-E5 kit, but they are 110 to 240v.
I had considered making a 12v adaptor for the ACK-E6 kit (5DmkII, 7D and 60D/60Da) but ofcourse it uses a proprietary plug on the battery lead.
The ACK-E5 looks like it might use a standard barrel plug for the false-battery, so you could probably get a 12v to 7.2v adaptor and make a patch lead reasonably easily.
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