My 7D Mk II battery mystery

I have a gripped 7D II and gripped 6D. I have 6 LP-E6 batteries that I rotate between the 2 cameras (2 Canon, 2 Watson, and 2 RAVPower).

About a month ago the internal clock battery died on the 7D II. Around that same time I started noticing that the camera starting killing batteries extremely fast. I have no idea if the 2 have anything to do with each other or if it's just a coincidence. Putting fully charged batteries in the 7D II and they will be dead in a week or 10 days without even using the camera. I have tested with and without the grip.

Here's an example. This morning I put a fully charged battery in the 7D II without the grip. I checked the battery info and it read 85%. This battery was fresh off the Canon charger with a green light. I turned the camera off and let it sit for 30 minutes. Turned it back on and checked the battery info and it read 53%. I hit the AF button a couple times then checked battery info again and it read 43%. I turned it off then back on and checked battery info and it was back to 53%.

I took the battery out of the 7D II and put it in the 6D and it read 80%.

I have no battery issues with the 6D but my 7D II is killing the batteries. Like I said, this issue started occurring around the same time the internal clock battery died. Could that have anything to do with it?

Just wondering if anyone has experienced something similar before it gets sent to Canon.

Must be this Corona virus thing. My 1D mkIV discharged completely three different fully charged batteries over three days. That was two weeks ago and it's back to normal now, but I am a bit worried...

Most recent cameras do not have a clock battery, they have a super-capacitor which stores a little energy from the main battery. I there is a fault with the capacitor or the circuitry then it is possible that the main battery could run down prematurely. The percentage battery indicator is very approximate and only offers a rough guide of the battery capacity and it often happens that following a short rest with the camera turned off then the percentage can be different.

An important thing to know about the 7D2 is that if you have the GPS enabled it can run down your battery very quickly even with the camera turned off because the GPS stays powered up.

I agree with Ramon-uk.

Rod

Ramon-uk wrote in post #19029427
Most recent cameras do not have a clock battery, they have a super-capacitor which stores a little energy from the main battery. I there is a fault with the capacitor or the circuitry then it is possible that the main battery could run down prematurely. The percentage battery indicator is very approximate and only offers a rough guide of the battery capacity and it often happens that following a short rest with the camera turned off then the percentage can be different.

An important thing to know about the 7D2 is that if you have the GPS enabled it can run down your battery very quickly even with the camera turned off because the GPS stays powered up.

Thanks.

After letting the camera sit all day yesterday unused the battery read 46% which was down from 53%. I took the battery out overnight but didn't charge it and put it back in this morning and it read 80%. I guess it will be going back to Canon.

Now I'm having issues with my 6D's AEB setting. Just started a couple days ago. Ugh.