Pretty Sure you are safe Tony...
Canon batteries are 7.2V nominal - probably closer to 8V fully charged. The Canon ac adapter puts out 7.8V - I use a dc-dc convertor fron Dork S that puts out 7.5V to drive my 20D. That is either connected to a 12v mains adatper (with surge protection) or a 12v 7AH battery depending on location.
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