topic Re: EOS R5 Ml II hot after idle in the backpack in EOS DSLR & Mirrorless Cameras

EOS R5 Ml II hot after idle in the backpack

thegios — Sat, 18 Jul 2026 04:12:52 GMT

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.

Re: EOS R5 Ml II hot after idle in the backpack

Waddizzle — Sat, 18 Jul 2026 06:13:53 GMT

Did you ever switch the camera off?

Re: EOS R5 Ml II hot after idle in the backpack

SignifDigits — Sat, 18 Jul 2026 09:30:29 GMT

Canon battery or aftermarket? Since you have multiple batteries, I would suggest you test with each to see if the problem is associated with just one of them. If it is a faulty battery then you should stop using that battery and recycle it.

Re: EOS R5 Ml II hot after idle in the backpack

thegios — Sat, 18 Jul 2026 12:54:55 GMT

Yes

Re: EOS R5 Ml II hot after idle in the backpack

thegios — Sat, 18 Jul 2026 12:55:43 GMT

Canon original

Re: EOS R5 Ml II hot after idle in the backpack

SignifDigits — Sat, 18 Jul 2026 13:16:09 GMT

"Since you have multiple batteries, I would suggest you test with each to see if the problem is associated with just one of them. If it is a faulty battery then you should stop using that battery and recycle it."

If it's the same on all batteries, then I suspect it is likely there is a fault in your camera and it needs service. The camera should not be draining that much from the battery when switched off.

Re: EOS R5 Ml II hot after idle in the backpack

shadowsports — Sat, 18 Jul 2026 14:11:30 GMT

Greetings,

Are you using a Canon lens?

In addition to a faulty battery or hardware, ensure that you have Bluetooth and Wi-Fi disabled when they are not being actively used.

Re: EOS R5 Ml II hot after idle in the backpack

Waddizzle — Sat, 18 Jul 2026 17:12:08 GMT

“

Are you using a Canon lens?

In addition to a faulty battery or hardware, ensure that you have Bluetooth and Wi-Fi disabled when they are not being actively used. “

This was my next line of thought. Disable wireless communications and what is attached to the lens mount.

Some of the third party mount adapters were known to drain the battery even though the camera was switched off.

Re: EOS R5 Ml II hot after idle in the backpack

SignifDigits — Sat, 18 Jul 2026 20:48:40 GMT

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?

Re: EOS R5 Ml II hot after idle in the backpack

thegios — Sat, 18 Jul 2026 21:14:26 GMT

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

The problem here is obviously different.

Re: EOS R5 Ml II hot after idle in the backpack

Waddizzle — Sat, 18 Jul 2026 21:57:13 GMT

“

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.

Re: EOS R5 Ml II hot after idle in the backpack

thegios — Sat, 18 Jul 2026 22:01:02 GMT

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.

Re: EOS R5 Ml II hot after idle in the backpack

Waddizzle — Sat, 18 Jul 2026 22:03:26 GMT

“ 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.

Re: EOS R5 Ml II hot after idle in the backpack

Waddizzle — Sat, 18 Jul 2026 22:13:25 GMT

“ 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.

Re: EOS R5 Ml II hot after idle in the backpack

thegios — Sat, 18 Jul 2026 22:21:22 GMT

All Canon: camera, battery, lens.

Re: EOS R5 Ml II hot after idle in the backpack

SignifDigits — Sun, 19 Jul 2026 11:38:40 GMT

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.

Re: EOS R5 Ml II hot after idle in the backpack

Waddizzle — Sun, 19 Jul 2026 13:49:55 GMT

“ The problem here is obviously different. “

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