On a recent road trip, I again noticed something odd which I had seen before with my E-M10. Firstly, with years of using Nikons before switching to m43, I have the habit of never switching off the camera. After running out of battery a couple of times with my E-M10, I have gotten better about turning off the camera when not in use. However, I will still sometimes forget to turn it off. With certain zoom lenses (O9-18 and O40-150R) mounted, when I bring up the camera again, the battery will be dead. This has never happened with either of my primes mounted. It happened on 3 separate occasions recently and (at least 2 of the 3 times) the battery was still showing a full charge when I had put the camera down. IN one case, I had shot less than 10 pictures on a fully charged battery. Luckily, I have gotten the message about battery life, so I had a spare available and no shots were missed. So, my questions: Has anyone else noticed this? Clearly, the camera is doing something while sitting there (or hanging around my neck) which is draining battery. Does anyone know what it is doing and if I can turn this thing off? I usually shoot with the rear lcd turned off. I would love to find a solution while I continue to train myself to switch the camera on and off every single time.