Lithium Ion battery for CPAP machine?

I'm trying to figure out how to power a CPAP machine (this one) for a few nights of backpacking/camping. Does anyone know how to hook it up to a lithium ion battery (and what type to get) with out forking over all my money to the medical supply industry? I'm dying to go backpacking for at least a night or two.

any help would be appreciated.


Look at the power brick for the unit. The unit uses 12VDC. Find a 12V battery that offers the most Ah that fits your budget and is a suitable size for going backpacking with. Get a DC jack and some wire and your all set. Just make sure you get the positive and negative leads in the right place.