EOS R3 battery drain issue

[AAA-J]

Hello,

I have reset my camera settings, lens is off, sd cards slot empty, no accessory attached.

Official canon battery. I have a moderate performance and a excellent one.

The battery would drain after 12hrs it be at 95%, and 24 hrs @ 88%. These are rough numbers.

I'm concerned because within a week of having the camera off, never turned on, with a freshly charged battery inserted the camera battery would be drained close to 0-20%.

EOS R3 #firmware 1.7.1

[Waddizzle]

Welcome to the Community. Sorry to hear about your experience:

It sounds like you have done your homework looking into the issue:  Here’s a checklist, most of which you have already done. In no particular order.

• Not switching the camera off when not in use.
• Using third party accessories, lens mount adapters in particular.
• Not disabling wireless communications when not in use, particularly GPS.
• Leaving cabling connected to the camera when not in use. 
  
  

I am sure there could be other causes I haven’t thought of today.  You made no mention about wireless communications, so I assume that you are not using it.

If the issue persists, call Canon Support.

[AAA-J]

Good catch, I have all wireless communications off, no cables attached, no third party accessory, always turn my camera off when not in use 99% (to cover the 1% of possibility not turning off when not in use, I've been doing tests with fully charged batteries with different performance), let me edit my post.