Question
If I see the "cannot communicate with battery" error message on a Canon 7D, is there any way to fix it without sending it back to Canon?
Answer
A few things to try:
- Try a second battery
- Try a second body
- Try OEM and third party batteries
- Accept the warning message about the lack of communication and try to use the battery anyways
- Try pulling the battery out and reseating it at least a few times
- Try removing the tiny watch style battery as well as removing the regular battery at the same time. This will reset some if not all things on the camera, so keep that in mind.
- Update your firmware to the newest version
- Try a battery grip if you have one
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