I was talking with Old Salt ( a CPAP user)  about what I use for a battery setup for my CPAP machine when I  go paddling in the Q. He suggested I post it in the QJ Gear Forum.

In 2012 I bought a Lightweight Travel Lithium Battery Pack for ResMed CPAP Machine from a website (You need to Login or Register to view media files and links)

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I am not sure if the battery technology has gotten better since I purchased  this CPAP setup in 2012 but this Lithium Battery Pack has served me well. It is a bit on the expensive side $299 but it is the lightest system I could find. Right now on sale at  cpapxchange for $297.99

The unit consists of a 12 volt converter that plugs into 12 rechargeable Lithium ion batteries tied in series and then plugs into my Resmed9 CPAP machine. I take off the humidifier when I go paddling since it uses more battery power. I can get 2  nights sleep per battery pack averaging 16 hours total per battery pack. I bring along 4 lithium battery packs with me and they weigh about 1.5 lbs. each. I do not recharge them on my trip.

I found this system to be lighter than most battery setups but I am still hoping that I can someday get the weight down even further.  There is a new light weight travel CPAP machine called "Transcend" that is advertising on the radio that looks like a possibility.

3 years ago I was diagnosed with severe sleep apnea using a sleep test and my Resmed9 machine and my Resmed AirFit P10 mask has been a God send. I can't sleep without CPAP. I have tried oral devices etc. and these substitutes just don't measure up. 

I have used this set up the last 3 trips to Quetico and it has worked well. CPAP users may want to give it a try.

Rich,

I just talked to a gal at CpapXchange and she told me that you would have to "special order" the lithium 12 AA battery pack with connector for $184 per pack...ouch   One battery pack comes with the $279 package with converter and bag etc. But since one battery pack will only do 2 nights on a Resmed9 you will have to order extra battery packs for your overnight trips ... unless you can figure out a lightweight and reliable system to recharge them in the wilderness. Solar ?

Mike

Back to CPAPs...

I dunno. Perhaps you're correct, a wood burning camp stove is a good way to recharge lithium batteries? It could be. Please run a few tests and post results.

I'm wondering if one could hook up 12 rechargeable lithium AA batteries in series cheaper than their option? MP? I certainly wouldn't want to void the warranty...

There are less expensive batteries ($45 - $50 per 8000mah would require < $60 charger) with comparable output with a life of over 200 recharges. What scares the He22 out of me is these things are in some cases keeping you alive.  What happens if the battery goes dead in the middle of the night?  If there was a alarm (don’t know how loud they are)  that went off when the battery needed to be changed would it wake you up so you could change it. 
The biolite produces about 2 watts @ 5 volts for recharging a cell phone.  If you could convert that 2 watts @ 5 volts to 2 watts @ 12 volts you could use it to charge one of the batteries we are discussing in about 48 hours. 
There are some solar collectors that may work to run the charger mentioned above and charge one of these batteries in a few hours.

solotripper wrote on Jan 12^th, 2016 at 10:40pm:

Technically yes practically not enough to make it worth it.  If you cooked for one hour per meal and 2 meals per day every 12 days you could get one more night.  That is if you could convert 5 volts to 12 volts with near 100% efficiency and the battery charger would work on that light of a charge.   
The unique thing about that stove is because of the fan it probably does not make your pan black. It is heavy though. 

I'm not sure if this would be helpful but it is an extraordinary battery pack made in the U.S.  It is a 12V 10Ah LiFePo4 battery pack that is sealed and quite durable in the wild.  It can provide both 12V and 5V output and weighs in at about 3 lbs.  It can also be re-charged with a compatible 18V solar panel (although I'm sure other panels that can supply enough voltage would work as well) as well as a wall charger.  LiFePo4 batteries are not quite as dense as LiPo batteries but are much more stable and can be recycled thousands of times.
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P.S.  Regarding using a solar charger: this pack has a built-in charge controller and all kinds of charge and discharge protection.