Interesting CPAP Lithium 30 amp hour battery + charger
http://www.ebay.com/itm/12V-30AH-battery-pack-lithium-Portable-emergency-camping-Power-Supply-30000-mAh-/262984164559?hash=item3d3b13e4cf:g:vZAAAOSwPK1ZQcsL
Forum Discussion
I got one thru the VA not that one plus a cord to plug into a 12 volt outlet. I can get a couple of days out of it before charging it. That with the humd turned off
