Volvo low voltage disconnect

Just got this Volvo and it's already giving me crap. I can only run my Webasto for about an hour after shutdown before the low voltage alarm wakes me up and all of my stuff shuts off and I start freezing. Bad battery maybe? I do have a 12v cooler, but that shouldn't be pulling THAT much power...

Edit* Sounds like I've got an air leak in one of the airbags that supports the cab, not one of the suspension bags though. Ticketable?