I recently was prescribed a CPAP through the VA (they provide everything for in home use and a 12v power cord). I have read through other threads, and most people have an on-board deep cycle battery already, which I don't, and mostly boondock. Does anyone here have any alternative methods of running a CPAP, that is not spending $300 on a battery that lasts 8 hours, or $500 for 2 nights? I have a ResMed AirSense 10 with the heated hose and humidifier. The book/s don't say the power usage per hour/night to help me put something together. Thanks for any links/help!