There are definitely good reason for being able to completely power down a camera, or car, for that matter. With both, the only option is to disconnect the battery. My truck was snowed in for 6 weeks this winter, the almost new battery had run down from the slow but steady current used to keep electronics alive. I recharged it, and since I do not drive it in the snow, I started it up and let it charge for a while after two weeks. I have snow tires for it, its just something I never bothered with this winter, and then came the snow, and more snow, and it kept on, but we had a thaw and a lot of rain last week, so we are down to a foot on the ground now. We are getting light snow, but not the serious stuff. I really pity those on the east coast, they had it worse than me. I have a tractor with a loader on the front and blade on the rear, so my 1/4 mile driveway is kept clean. Its difficult to find a place to stack all that snow.