Choosing a Battery

General Discussion on any topic relating to CPAP and/or Sleep Apnea.
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SleepGeek
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Re: Choosing a Battery

Post by SleepGeek » Sat Jan 16, 2021 2:28 pm

Pugsy wrote:
Sat Jan 16, 2021 2:18 pm
Attention ResMed users....ResMed machines run off 24 volt...not 12 volt so you all need the converter as well as any special plug to attach to a battery. There is no way around it.
So Respironics users...when you advise a ResMed user what connections that they might need....don't forget that converter thingy...and it costs around $80 or so and this is one time I would NOT go with aftermarket because I have heard too many times that aftermarket didn't work so great.
Exactly the reason I suggested they *call* cpap.com instead of choosing off the website. Of course either way the user will need to know the exact make & model cpap, bipap, or whatever.

Also note that when using the *correct DC cord* for any cpap (incl. Resmed) the power cord is designed to be used with a 12V DC battery.
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palerider
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Re: Choosing a Battery

Post by palerider » Sat Jan 16, 2021 4:00 pm

zonker wrote:
Sat Jan 16, 2021 12:04 pm
but i would like to have a link to hand to let people know who come in and ask the question. it doesn't happen all the time, but often enough. i'm here more often than you are and would like to be able to help a person out (with all due credit to you of course) without forcing them to go through this thread.

thank you!
Right here: viewtopic.php?p=1129137#p1129137

It's linked off the first post in the thread.

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zonker
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Re: Choosing a Battery

Post by zonker » Sat Jan 16, 2021 5:16 pm

palerider wrote:
Sat Jan 16, 2021 4:00 pm
zonker wrote:
Sat Jan 16, 2021 12:04 pm
but i would like to have a link to hand to let people know who come in and ask the question. it doesn't happen all the time, but often enough. i'm here more often than you are and would like to be able to help a person out (with all due credit to you of course) without forcing them to go through this thread.

thank you!
Right here: viewtopic.php?p=1129137#p1129137

It's linked off the first post in the thread.
d'oh!

well that was too easy. and it's only gone up seven bucks in the last couple years.

will tuck the link away.

thanks!
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SleepGeek
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Re: Choosing a Battery

Post by SleepGeek » Sat Jan 16, 2021 5:36 pm

That is an excellent choice in batteries. I put a couple of those together several years ago after watching the 11 O'Clock news warning of major power outages following an incoming storm. I went down to Walmart was the only place open that time of nite and bought a 100Ah battery to put in a case I already had. I figured I could get several days before needing a re-charge IF needed. The down side is the battery weighed 60+ lbs. iirc. Rather heavy IF you want to be mobil.

That said the 35Ah battery weighs in at about 1/3. And if you are good at the wiring you can put together say 2 or 3 so you can use 1 while charging the others.

ps. - so like having insurance the power outage never happened. So I keep it charged for good luck but also went for a couple of the 35Ah. I used 1 to power a field cam in the woods behind the house. Thought about hooking it up to solar but never did cuz of the dense trees.
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Air Jordan
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Re: Choosing a Battery

Post by Air Jordan » Wed Mar 03, 2021 1:51 pm

Air Jordan wrote:
Fri Jan 15, 2021 2:50 pm
CapnLoki wrote:
Thu Mar 30, 2017 3:14 pm
My Backup Battery Setup
Components of my current home setup copied from a recent post, with a few edits:
UPDATED 5/17/2018
Is there a current update?

I'm wanting something very simple for an occasional one-night power outage. My machine is a ResMed AirSense 10 AutoSet and the humidifier is not a firm requirement. Currently, I am living in the city in a small third-floor walkup that was built around 1910 - closet space nearly non-existent, and storage space, in general, is very tight.

The landlord's daughter and her family live on the first two floors. The daughter sees everything that gets delivered to me. If she would see what looks like a car battery and battery box being delivered, she might unhinge.
OK, guys, check this out. I'm about to order.

I found a ResMed guide that says my AirSense 10 Autoset at pressure 12 will run for 8 hours (plus 50% safety margin) (without heated hose/heated humidifier) on a 13 AH battery. https://document.resmed.com/en-us/docum ... lo_eng.pdf

So, I found a very small 14 AH battery that appeals to my situation (small apartment/Karen landlord) - https://www.batteriesplus.com/productde ... kdc12=14nb ----------- $60 (+shpg??)

I will also buy a ResMed converter - https://www.cpap.com/productpage/resmed ... 0-machines ----------- $85 (+shpg??)

A friend is giving me this charger - https://www.walmart.com/ip/Everstart-Ma ... /493123163 He says it was only used once in an emergency and is still in the box.

I would dearly appreciate if someone would look at this selection. Will it get me through a one-night power outage? If we are ever out more than one night, I'm going to have to do something drastic to cover other issues.

Thanks!

(Wow, the forum has gotten very difficult to access. It took many attempts to get logged in.
Jordan

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SAG
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Re: Choosing a Battery

Post by SAG » Sat Mar 06, 2021 9:49 pm

Paraphrasing Ghandi - be the change you wish to see in the world.
Paraphrasing JohnnyGoodman - Beware the person who wishes to legislate the morality and the behavior of his neighbor.
https://cutt.ly/GbE7ltf

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palerider
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Re: Choosing a Battery

Post by palerider » Mon Mar 29, 2021 7:56 pm

SAG wrote:
Sat Mar 06, 2021 9:49 pm
viewtopic/t64943/Another-Battery-Option.html
What kind of a moron posts a link to a post that is nothing but a link to a poor option?

Oh, I see, your kind.

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joeslide
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Re: Choosing a Battery

Post by joeslide » Tue Mar 30, 2021 6:09 am

I would stay away from lead acid batteries. Scroll down on this link and look at the discharge plot of LiFePO4 vs SLA. Long story short: Don't buy a $60 battery for a $600 CPAP...

You get about half the time with a lead battery than LiFePO4. Take a look at the Bioenno 24 Volt LiFePO4 . You'll have to get/make an adapter...

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Midnight Strangler
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Re: Choosing a Battery

Post by Midnight Strangler » Tue Mar 30, 2021 12:30 pm

joeslide wrote:
Tue Mar 30, 2021 6:09 am
I would stay away from lead acid batteries. Scroll down on this link and look at the discharge plot of LiFePO4 vs SLA. Long story short: Don't buy a $60 battery for a $600 CPAP...

You get about half the time with a lead battery than LiFePO4. Take a look at the Bioenno 24 Volt LiFePO4 . You'll have to get/make an adapter...
Do you know what you are talking about? You need to know to what use the battery will be put before making a recommendation.

I bought an 18 AH lead-acid deep-cycle AGM battery 7 years ago for less than $50.The battery was purchased for use as an at-home backup in an occasional power outage. I used it 3 single nights over the last 7 years. It served me very well. I just bought a near-identical repacement battery for $60. It will serve me over the next 5 to 7 years.

amenite
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Re: Choosing a Battery

Post by amenite » Tue Mar 30, 2021 8:50 pm

joeslide wrote:
Tue Mar 30, 2021 6:09 am
...
You get about half the time with a lead battery than LiFePO4. Take a look at the Bioenno 24 Volt LiFePO4 . You'll have to get/make an adapter...
You get about half the time? You would get about half the time with a battery that had half the usable capacity (Watt hours). Battery type is not so relevant for that calculation. It's true you can probably safely discharge deeper with a LiFePO4 battery, but it's not a huge difference.

Best advantages of the LiFePO4 chemistry are 1. Less weight for the same capacity and 2. They lose very little charge while in storage - constant trickle charge is not needed.

LiFePO4 will cost you several times what a comparable capacity AGM battery would. If used frequently LiFePO4 they are supposed to handle many more charge/discharge cycles than AGM or other lead acid chemistry. If you only use them a few times per year the longevity benefit is negated, and may not be worth the added cost.

joeslide
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Re: Choosing a Battery

Post by joeslide » Wed Mar 31, 2021 7:10 am

Midnight Strangler wrote:
Tue Mar 30, 2021 12:30 pm
joeslide wrote:
Tue Mar 30, 2021 6:09 am
I would stay away from lead acid batteries. Scroll down on this link and look at the discharge plot of LiFePO4 vs SLA. Long story short: Don't buy a $60 battery for a $600 CPAP...

You get about half the time with a lead battery than LiFePO4. Take a look at the Bioenno 24 Volt LiFePO4 . You'll have to get/make an adapter...
Do you know what you are talking about? You need to know to what use the battery will be put before making a recommendation.

I bought an 18 AH lead-acid deep-cycle AGM battery 7 years ago for less than $50.The battery was purchased for use as an at-home backup in an occasional power outage. I used it 3 single nights over the last 7 years. It served me very well. I just bought a near-identical repacement battery for $60. It will serve me over the next 5 to 7 years.
Do I know what I'm talking about? Sometimes yes. Sometimes no. They do make these devices to protect from voltage decay as the lead battery discharges. The problem is real whether you have experience it or not...

joeslide
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Re: Choosing a Battery

Post by joeslide » Wed Mar 31, 2021 7:35 am

amenite wrote:
Tue Mar 30, 2021 8:50 pm
joeslide wrote:
Tue Mar 30, 2021 6:09 am
...
You get about half the time with a lead battery than LiFePO4. Take a look at the Bioenno 24 Volt LiFePO4 . You'll have to get/make an adapter...
You get about half the time? You would get about half the time with a battery that had half the usable capacity (Watt hours). Battery type is not so relevant for that calculation. It's true you can probably safely discharge deeper with a LiFePO4 battery, but it's not a huge difference.

Best advantages of the LiFePO4 chemistry are 1. Less weight for the same capacity and 2. They lose very little charge while in storage - constant trickle charge is not needed.

LiFePO4 will cost you several times what a comparable capacity AGM battery would. If used frequently LiFePO4 they are supposed to handle many more charge/discharge cycles than AGM or other lead acid chemistry. If you only use them a few times per year the longevity benefit is negated, and may not be worth the added cost.
As an amateur radio operator (ND2C) I have dabbled in this area. This guy has actually performed capacity tests (over 95% energy expended before voltage drops) on LiFePO4 batteries. You will not know how long a battery will last until you test it. Tornados in North Alabama have taken out power for a week. It also depends on how important having a CPAP is to you...

amenite
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Re: Choosing a Battery

Post by amenite » Wed Mar 31, 2021 2:56 pm

It's not an apples to apples comparison. Any lithium is going to maintain voltage until nearly depleted - when voltage falls off a cliff; it's a characteristic of that chemistry. This does not mean there is less energy available along the entire discharge/voltage curve for an AGM or othter lead acid battery. The voltage drop is expected and the devices can generally handle it.

joeslide
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Re: Choosing a Battery

Post by joeslide » Thu Apr 01, 2021 9:38 am

amenite wrote:
Wed Mar 31, 2021 2:56 pm
The voltage drop is expected and the devices can generally handle it.
You don't know that. Want to test it on your $600 CPAP? A CPAP is not a golf cart that starts to slow down as the voltage starts to drop...

amenite
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Re: Choosing a Battery

Post by amenite » Thu Apr 01, 2021 2:23 pm

joeslide wrote:
Thu Apr 01, 2021 9:38 am
amenite wrote:
Wed Mar 31, 2021 2:56 pm
The voltage drop is expected and the devices can generally handle it.
You don't know that. Want to test it on your $600 CPAP? A CPAP is not a golf cart that starts to slow down as the voltage starts to drop...
I have tested it. With both AGM and LiFePO4 batteries. I recently retired my second PRS machine - a PRS 560 - after 5 years of use to be my new backup machine. It never complained about battery power of either kind.