EOS R5 Ml II hot after idle in the backpack

[thegios]

Ok here's something strange that happened to me today for the first time in 2 years I've had this camera.

I came back to the hotel around 19.30 after a day walking in Montreal. I've kept the camera always hanging on my neck with the strap just to put it back into the backpack for the last hour of walk. I changed battery just a few minutes before putting the camera in the backpack around 18.00, to shoot a couple of photos, so battery in camera was at 100%. Once to the hotel I took the card out to transfer pictures on an external SSD, then I put card back in, put the camera in the backpack again and I left the backpack on the table, had a shower and went out without the camera.

I came back three hours later, opened the backpack to take the camera to download some pics on the phone and found it very hot: the heat was concentrated at the back, behind the LCD and in the battery slot. The camera switch was off. When I turned on the camera the battery was at 50%.

I removed battery (that was a little hot as well) and let it cool down, it took 10 minutes.

The camera is working fine, but I have no idea what may have happened.

[Waddizzle]

“ 

They don't! And even if camera remains switched on it'll go in standby.

The problem here is obviously different. “

Standby is not the same as switching the camera off.  When the camera goes to sleep the wireless communications remains active.

How else do you think the camera can be awakened wirelessly?  Leaving wireless communications active active also drains your battery.

[thegios]

Anyhow, on my camera Bluetooth and Wi-Fi are ALWAYS off (I turn them on only in the hotel to get h some pics but then turn them off immediately). And the camera was off.

[Waddizzle]

“ Do Bluetooth and/or wireless operate even when the camera is switched off?   I thought of those as draining the battery with the camera switched on, but with the switch off do they continue to operate? “

Yes! Wireless communications continues to run while the carriers is sleeping.  Switching the camera IFF will shutdown wireless communications. 

[Waddizzle]

“ Anyhow, on my camera Bluetooth and Wi-Fi are ALWAYS off (I turn them on only in the hotel to get h some pics but then turn them off immediately). And the camera was off. “

Standby is not the same as switching it off.

Again.  What lens and accessories are connected to the camera.  Please be specific with manufacturer name and complete model numbers. 

[thegios]

All Canon: camera, battery, lens.

[SignifDigits]

Again, I recommend that you try the other batteries.  If you see the same behavior with all of them call Canon.  I would expect the camera will required service.  If it's just one battery, then I would assume that battery is bad and should be recycled.

[Waddizzle]

“ The problem here is obviously different. “

Contact Canon Support, 1-800-OK-CANON.