I'm preparing for a trip that will have me away from power for a few days. So I decided to test the collection of batteries I have to see which are the best as the battery life for the GM1 is fairly abysmal. I don't know exactly, but I'm guessing I typically get 100-150 shots per battery and at times less. I put my GM1 on a tripod with my P14 lens and put it in time lapse mode shooting raw (or does it default to jpeg in that mode?) I set it to take a photo every ten seconds so the camera was on the entire time. Well, 2 hours 20 minutes and 860 shots later, it finally died. I was astounded. I would be thrilled if I got 1/3 that many shots and anywhere close to 2 hours of power-on time from a battery while traveling and shooting. So now I'm wondering what part of the camera operation draws the most power. Is it powering it on and off? Does the sleep mode (with the switch still on) drain the battery? Is it focusing? Based on this limited test, it doesn't seem to be powering the display, taking a picture, or writing to the card. Any ideas why I got so many shots from this battery compared to what I typically see?