Well this has hit my 7D out of nowhere. This problem just started with my 7D. apparantly my battery is not registered to my camera. I think there is some type of design flaw that when the camera is subjected to an extreme temperature change something in the battery compartment is expanding or shrinking and preventing one of the pins that communicate with the chip on the battery that tells it is a genuine canon battery. I've had the 2.03 firmware since early Sept 2013 though. Same as above, I use a grip with 2 real Canon batteries, never had a problem with the 1.25 firmware. This happens with both batteries and never happened before. Turn the camera on, "Cannot Communicate w/ Battery - Use This Batter? Nothing out of the ordinary until a few hours ago. Cancel or OK". I get a reading that tells me Cannot communicate with battery. I think there is some type of design flaw that when the camera is subjected to an extreme temperature change something in the battery compartment is expanding or shrinking and preventing one of the pins that communicate with the chip on the battery that tells it is a genuine canon battery. Here is how I fixed my Canon 7D. I dodn't know if the original 2 batteries were 3rd party made to look like Canon, or if the date stamp was a new addition later in production. The camera was used to shoot sports at Jesuit High School and used a lot, but very well cared for… I couldn’t believe that the cameras shutter actuation count was 256,868!! Can anyone help. Well, i use an eos 60D, which had the same problem as the 7D.The problem was not from the camera, or batteries (I use an original canon battery and a replica made for 60D). I have personally experienced the “can’t communicate with battery” message when using a genuine Canon battery (the one that came with the 7D). I have a 7D with 2 Canon LP-E6 batteries - couple weeks ago i got "cannot communicate with battery" errors with both batteries - reseated the batteries a few times and everything started working again until this morning. Didn't help in the least for me to remove that battery and do a reset, unfortunately. I turned it on this morning and the LCD said "Cannot communicate with battery Continue to use this battery? When Canon got my camera body, they claim it was working just fine, so they say they did no repairs of any sort. I have also seen them both operate fine above 113F without any apparent problems. Called Canon, who suggested removing the date/time battery and then putting it back. 7D owners, I hope this fixes your problem, don't waste your time resetting the camera, putting it in the freezer, polishing battery contacts, but if that fixes your camera good, otherwise, it's probably caused by a loose fastener (screw) inside. ! Canon 7D Testimony Recently, we had a customer bring in a 7D for a standard sensor cleaning. I have two Canon batteries and it's the same on both. It's right inside the normal battery compartment. ... Canon EOS 7D Canon EF-S 10-22mm F3.5-4.5 USM Canon EF-S 17-55mm f/2.8 IS USM Canon EF 100-400mm f/4.5-5.6L IS USM +2 more. After you remove the first battery, its right there near the hinge of the battery door. I've read several forums with solutions from send it to Canon for repair ($205) to freezing the camera for 6 minutes and then placing a warm battery in the camera (not going to even try that one). I recently saw a Canon 7D and 60D operate at temperatures of 19 and 20F without any problems. swapped battery with newly charged one, and still no power. This still doesn't explain why this new battery seems to have triggered the problem on the 7D, and why all 3 batteries were affected. 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2020 canon 7d cannot communicate with battery