Fear not.

The car will self-regulate by shutting off IMA and keeping it in 6cyl and recharging at every opportunity. I've seen my car stopped, running at idle with some recharge bars lit. It will also disable autostop if there is not enough energy in the 144v battery for several high-voltage starts. And beyond that, there's still the 12v starter, off the 12v battery.

I think most of that info is in the owners' manual, or somewhere on the Honda site. I don't recall where I read it, but it was a Honda source.

The AC compressor is electric and ICE driven according to Honda... haven't looked at the specifics of how that occurs. If the battery runs down the AC won't shut off- the engine will jsut stay on- its got to recharge the pack at that point, anyway.