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I have the same problem described in the following question but for the Canon T6s:

How can I fix a "Cannot communicate with battery" error on Canon 7D?

I think it is just a loose screw since it sounds when I move the camera back and forward.

However, the construction of the camera is different and can't find a service manual to guide the process of disassembling.

Anyone with experience on technical service for this model? Any help is appreciated.

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    Before you go tearing your camera apart be sure the the sound you hear isn't inside the pop up flash, which has a rattle inside that is perfectly normal when the flash is stored in the down position. – Michael C Aug 23 '16 at 2:03
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    Are you using a Canon battery or a third party clone? Have you tried a different battery? Have you tried the same battery in a different camera? – Michael C Aug 23 '16 at 2:05
  • Thank you @MichaelClark, I will pay attention to the flash. – Memochipan Aug 23 '16 at 2:41
  • Yes, I have tested the camera with other original batteries and have the same problem. – Memochipan Aug 23 '16 at 2:42
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    Please see page 391 of the EOS Rebel T6s Instruction Manual: gdlp01.c-wss.com/gds/4/0300018244/01/… – Michael C Aug 23 '16 at 8:01
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If multiple batteries exhibit the same problems, then either the electronics that talk to the battery have failed or the communication contacts have some pocket lint stuck to them. My money would be on the latter. Try wiping them with an alcohol-covered swab.

If that doesn't help, just know that it isn't a fatal problem. You can ignore it. The camera is capable of checking the battery voltage and doing approximately the right thing even if communication isn't working; it might shut down earlier to avoid the risk of a partial shot write, but otherwise, AFAIK, the problem is ignorable.

Or you could get a grip, so your batteries will use a whole different set of contacts that probably don't use the same I2C bus or whatever it is.

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