What did you do to your Class C MH today???

Comparatively speaking, a few smoke and CO detectors pull a few drips out of a bathtub full of electricity. If your battery goes dead in 10 days, I think you've either got a bad battery or some other electrical "leech" going on. I'd start with cleaning the battery terminals really good, making sure any and ALL electrical loads are switched off, wait 10 days, and go from there...or get your hands on a good multimeter and do a load check while flipping breakers on and off and finding that "leech" load.