The STK battery has been reverse engineered so that the warning will not be seen with the 6D. Presumably this adaptation will also apply to the new 5DIII firmware. I purchased a few of these STK batteries, and indeed it seems to work as claimed with no warning. The battery info does show up in the 6D menu with these batteries.
Mike K
Apr 30, 2013 at 11:35 AM
Previous versions of Mike K's message #11520604 « Canon now warning us about third party batteries. »
