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More than likely I think.
If you're looking for official Canon, then I'm not too sure, but if you don't mind third party, then I would suggest eBay.
You need a car charger for the BP-511a (I think it's the a which signifies the higher rated), rather than a specific one for the 20D.
I've seen one for my 350D (the NB-2LH), so I would assume that there is one for your battery too.
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