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Author Message   David_ritchie Tinkerer Username: David_ritchie Post Number: 32 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Wednesday, February 20, 2008 - 07:06 pm:    Dgillette, thanks a lot. I picked up some o rings today and found that they do allow the use of 675 batteries in the Canon G-lll camera. It is a sloppy fit but it works. The o ring size is 7/16" ID and 9/16"OD. Using an o ring you may have determine the polarity by trial and error. It will not work if the battery is installed backward.