Battery problem 5D

While I was on holiday I encountered a strange thing with my 5D's batteries.
I have 3 Canon ones and 2 off-brand, but it occurred to all of them. When I popped in a freshly charged battery the indicator said it was full. I put my camera on after five minutes and the 'battery low' indicator shows up. After a few seconds it flashes, then I got the 'battery empty' indicator. I switch batteries, and the same thing happens. I put the first one again in and everything is fine. Full battery. I was able to shoot with it for 2 or 3 days. Next time, same thing with other batteries.

I use the battery grip all year, but when travelling I prefer to take it off for weight and size in my bag. So I was running on one battery instead of 2. At the end of the holiday I put the grip back on and I haven't had any issues since then.

Does anybody know what happend? Or had the same thing?

Bert,, did you fly to your holiday destination?

This happened to me once.. I fully charged three batteries,,one Canon, two 3rd party batteries. All three batteries are in top condition. Carried my gear as carry on luggage.

I flew from Vientiane via Bangkok (4 hr stop over, didn't use my camera) into Sydney..

Getting home, all three batteries were dead, not a trickle of charge. Charged them and they worked perfectly,,and have ever since. I have flown many times since,,it has never happened again.

No, I went on holiday by car.
It would have made sense more or less if it happend upon arrival, but they were fine for the first 8-9 days. All the time they were stored in a pelican case in a dry place.

Strange that they decharged on the plane. Did you ever found out why this happend?

Cpt.Vanquisher wrote in post #12922289
No, I went on holiday by car.
It would have made sense more or less if it happend upon arrival, but they were fine for the first 8-9 days. All the time they were stored in a pelican case in a dry place.

Strange that they decharged on the plane. Did you ever found out why this happend?

No,, it never happened again, not even on the return flight to Vientiane.

Anybody ever had the same thing happening with their 5D?