Assuming that when you disconnect the battery, you also unplug the Bargman cord from your tow vehicle and the campground power cord from the power post, I don't think you need to do anything.
If you collapse the bathroom walls, which lets the silver push-button switch rise, it should cut off the CO detector immediately. Mine always gives one last squeak as the wall comes down.
If yours is wired differently, then it may squeak for a few seconds using the residual stored power in the caps that Shane mentioned. (These caps are in the converter.) But this power will dissipate in several seconds and the squeaking will stop.
Why don't you add your TM year and model to your signature, like mine below? Since different TM models and years have small differences, it helps us a lot if you tell us what you've got, as we try to answer your question. Thanks.
Bill
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