OK, my first (hopefully not last) post.
I have a weird problem, I suspect the camera has gone bad as I can find no other forum posts on the same subject. However....
7D, bought brand new in January 2012. Everything is genuine Canon, batteries, lenses etc. The camera has been great, the batteries lasted weeks between charges even if the camera was used. However, the last 3 weeks, when it has been in its bag, physically turned off, it has been flattening the batteries in 3-4 days. I have 2 genuine Canon batteries, it does it to both. I have a Sandisk and a Duracell (both 32GB) CF cards, tried leaving it with both in and out. Have tried leaving it with the 18-135 and 70-300 lens, and with no lens, it still flattens the battery in 3-4 days. It didn't do this before the last 2-3 weeks, and nothing that I am aware of has happened to the camera.
If anyone has any thoughts, I'd be glad to hear them