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Awful camping experience with CPAP - HELP!
#11
RE: Awful camping experience with CPAP - HELP!
Thanks for the follow-up. Without posting a link, what brand and model of battery did you get?
Sleeprider
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#12
RE: Awful camping experience with CPAP - HELP!
(12-06-2020, 11:42 PM)Sleeprider Wrote: Thanks for the follow-up. Without posting a link, what brand and model of battery did you get?

Well, I thought I was buying an Australian-made battery but, needless to say, it's stamped 'Made in China'.

It's called an Eclipse Deep Cycle AGM 130AH and cost AUD270 with a rather neat bonus gift: a 'Gallant Gear Multi Tool' (axe/hammer/knife/etc). 

The battery has an LCD voltmeter built-in and came with a 5yr warranty.
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#13
RE: Awful camping experience with CPAP - HELP!
That didn't last long.

I went on my third camping trip with the new battery setup last week. Everything went OK, but I noted that the battery meter attached to the battery was reading 'empty' (a little battery icon with bars) yet the actual voltage shown was 12.29V. Odd.

But when I got home and put the battery on my smart, seven-stage charger overnight, the meter on the battery still said empty and 12.29V, despite the charger indicating that it was fully charged.

I don't know what to make of this. Maybe fact that my CPAP seemed to be running OK and the battery charger is new suggests that the meter on the battery is faulty? I have emailed the folks who sold me the battery and I'm hoping for a response on Monday.
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#14
RE: Awful camping experience with CPAP - HELP!
Batteries are great above 12.8 VDC, but charge state drops quickly.  It is recommended that a battery not be drawn below 50%, so for safety, many devices shutoff automatically at about 21.2 VDC. Here you go:

[Image: Car-Battery-Voltage-Chart.jpg]
Sleeprider
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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
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#15
RE: Awful camping experience with CPAP - HELP!
Thanks. There's no mention of discharge protection in the battery's description though, and when I picked the battery up 'fully charged' from the dealer, it was only reading 12V or so. It then powered the CPAP for two nights OK.

The second time I used it, the battery charged up to around 14V according to the built-in meter and, once again, operated the CPAP for two nights without problems.

The third time, once again starting off with 14V or so, it operated the CPAP OK but then developed this weird apparent 'full discharge' issue despite reading 12.3V. Then there's the problem of its apparent refusal to recharge, in spite of the charger saying it's full.

But it's looking like the built-in meter is indeed faulty, because I just put a hand-held meter on the battery and it reads 13.6V, so back to the dealer it goes!
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#16
RE: Awful camping experience with CPAP - HELP!
I think a known good meter is definitely better. That is odd behavior, and there are battery testers that can sort out the individual cells and resistance in the battery, but I don't have one. A discrepancy of 12.26 and 13.2 is a lot. Most of my batteries seem to settle in at 13.2 volts after a charge and resting for a day.
Sleeprider
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____________________________________________
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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
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