I just got my mark iii back from Canon as it was showing Error 80. They said they fixed the problem, but then the battery was draining really fast too. Turned out the technician had switched the auto power off setting to never. Changed it to 4 minutes and I'm fine again. Don't know if that helps? Platinum CPS to the rescue
July 22, 2014, 12:02:00 PM
Topic: Unusual rapid battery drain with 5D III (Read 2583 times)
When you plug it into the computer the camera can't sleep so it uses a lot of battery. I see the same thing with my 5DIII's. When I unplug them, I can shot all day with them. At weddings I don't every turn them off, I leave them on all day and get well over 1000 photos per battery.
Thanks for all your comments. There was zero battery drain overnight when turned on but not connected to the computer. The puzzle is why the battery drain is so great when plugged into the laptop - I drained two batteries during an hour of FoCal.
5D III, 70D, Powershot SX50, 300/2.8 II, 1.4xTC III, 2xTC III, 70-200/4 IS, 24-105, 15-85, Sigma 10-20, Tamron 150-600.