I also use a cpap, remstar.
If you go with the diy battery option, buy the protection circuits.
I keep a battery for power outages/disasters and as fate would have it, have lost power for approx 4 weeks during the last 2 years.
My recent post on the cpap and hanging it in the hammock
The battery is fine for car camping and I go 4-5 nights on a single charge.
Haven't used the humidifier in many months.
Been sleeping in the hammock outdoors for the last 30 days and the battery makes it all possible.
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