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Yes, it's a clean design, but I wouldn't characterize it as 'repairable'.
I was amused to see that the time-and-date battery isn't user-replaceable. I guess that Canon figures the battery will last beyond the planned service life of the camera.
I'm curious because I've never had one wear out, but then we don't keep cameras more than a couple of years. Those who've had to replace them, can you tell me how long it lasted?
I recently replaced the clock battery in my 5D from 2008. It was really easy, and cheap too. I tend to keep my stuff for a long time, so it's disappointing to hear that one can't change it oneself in the 6D.
The other 5D was manufactured in 2005 or 2006 (not sure, but the serial number starts with a 0) and its battery still works fine!