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Old 07-06-2012, 11:05 PM   #1
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Rubix cube's Avatar
Join Date: Mar 2012
Posts: 111
CPAP batteries for folks with high pressure settings

Both my wife and I have relatively high pressure settings (13 and 16) on S8 CPAP machines. In addition we like to use humidifiers, so our total draw is 15 amps or 7.5 per. The S8 requires a reverse polarity compared to most machines. I would think this polarity switch would cost AmpH too.

Previously we tried some batteries from CPAP Batteries Inc, but found they only lasted 4 hours without humidifiers. To their credit, CPAP Batteries Inc did refund us minus 15% restock.

Has anyone used batteries from the Battery Geeks for the same amount of Amps, humidifiers and pressure setting ?
Model numbers:
N-C13500 claims 8hrs.-16hrs. runtime per charge on average*
N-C20000 14hrs.-24hrs. runtime per charge on average*
N-C40000 28hrs.-48hrs. runtime per charge on average*

* please note that run times will vary based on machine make & model, pressure settings, inverter/converter use, and humidifier use. (their disclaimer - and the reason for my question)

Of course battery performance depends on temperature too, so please let me know what the environment was you observed your battery's performance in.

Thanks for your help.

Dave Foghorn
2011 Pleasure Way Plateau TS
& soon, 2012 Mini Clubman S toad
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Old 07-06-2012, 11:15 PM   #2
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Join Date: May 2011
Location: Vancouver, WA
Posts: 22,426
I just run mine off the inverter in the MH, but then we have a 2000 watt inverter and four 6 volt 232 amp hour batteries

2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey
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Old 07-08-2012, 02:46 PM   #3
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Join Date: Dec 2007
Location: Tavares, FL
Posts: 1,644
I use a Bi-Pap and power it via a 400 watt (800 max) it can run multiple nights with no problem. I have 2 each 110 Amp hour AGM batteries. The inverter is plugged into a cigarette lighter in our bedroom. I think doing it this way instead of using a dedicated C-PAP battery as you tried. Many other RV'ers do this similar system. We love to boon dock and this system permits it. You might also look into a BI-PAP as the pressures are lower and they are much more comfortable.
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