I'm about to start setting some guinea eggs in my incubator, my second hatch ever. We're leaving on vacation next week for ten days. My pet sitter is going to be watching the water level and such, but I don't want to have to worry about a power outage while I'm gone. I thought the hovobator had a battery backup you could buy, but all I'm seeing is an adapter that you attach to a car battery. that doesn't seem like a backup, but more of an alternative power. Is there a battery backup you can attach to run in case of a power failure but otherwise run off electric? If not, how long can you run an incubator on battery power? Should I just leave it on the battery for 10 days? Thanks!