Choosing a Battery

hiker wrote: ↑

Tue Sep 10, 2019 6:45 pm

Above where he says the battery will be 5% higher or 12.6 V at 70% charge he says:

'Checking the terminal voltage of a lead acid battery – a fully charged 12 Volt battery can display an actual voltage up to 10% higher.'

Or 13.2 at 100% so for whatever reason I am not getting that.

Freshly charged batteries can retain an artifact of the charging called a "surface charge." This dissipates quickly when a small load is put on the battery, but it can trick people into thinking a battery is more fully charged than it really is. There are other issues that affect the voltage, so it is a less than perfect indicator of charge state.

CapnLoki wrote: ↑

Sat Jul 27, 2019 2:00 pm

Going by the ResMed Battery Guide: https://www.resmed.com/us/dam/documents ... lo_eng.pdf

...

In this ResMed Battery Guide, what does "HME" stand for? (It's used on the chart on page 14. I did not see any glossary in that pdf.)

almadenmike wrote: ↑

Thu Sep 12, 2019 3:53 pm

CapnLoki wrote: ↑

Sat Jul 27, 2019 2:00 pm

Going by the ResMed Battery Guide: https://www.resmed.com/us/dam/documents ... lo_eng.pdf

...

In this ResMed Battery Guide, what does "HME" stand for? (It's used on the chart on page 14. I did not see any glossary in that pdf.)

Home Medical Equipment

palerider wrote: ↑

Thu Sep 12, 2019 6:27 pm

almadenmike wrote: ↑

Thu Sep 12, 2019 3:53 pm

CapnLoki wrote: ↑

Sat Jul 27, 2019 2:00 pm

Going by the ResMed Battery Guide: https://www.resmed.com/us/dam/documents ... lo_eng.pdf

...

In this ResMed Battery Guide, what does "HME" stand for? (It's used on the chart on page 14. I did not see any glossary in that pdf.)

Home Medical Equipment

Thanks!!

Looks like I almost got ripped off buying a lithium battery, not understanding the Ah (or mAh) is meaningless without specifying how many volts (http://cpaptalk.com/viewtopic/t178212/T ... se-10.html). I almost bought this Talentcell battery (https://www.amazon.ca/gp/product/B078T7M9HZ/). It's confusing because there are a ton of reviews (on different listings for the same battery) stating that it works great for CPAP, some even stating Resmed Airsense 10 (which is what my husband uses). What is up with that? Are they fake reviews?

Does anyone have an alternative suggestion for a lithium battery under $100 CAD? Here in Canada, the scooter or deep cycle lead batteries don't seem very cheap, and I'd have to get a charger for it as well. If not under $100, what about under $200?

threehappypenguins wrote: ↑

Tue Jan 14, 2020 11:49 am

Looks like I almost got ripped off buying a lithium battery, not understanding the Ah (or mAh) is meaningless without specifying how many volts (http://cpaptalk.com/viewtopic/t178212/T ... se-10.html). I almost bought this Talentcell battery (https://www.amazon.ca/gp/product/B078T7M9HZ/). It's confusing because there are a ton of reviews (on different listings for the same battery) stating that it works great for CPAP, some even stating Resmed Airsense 10 (which is what my husband uses). What is up with that? Are they fake reviews?

Does anyone have an alternative suggestion for a lithium battery under $100 CAD? Here in Canada, the scooter or deep cycle lead batteries don't seem very cheap, and I'd have to get a charger for it as well. If not under $100, what about under $200?

Your best bang-for-the-buck is definitely a scooter battery, but then you will also need a battery tender and a box.

I bought a power-station at Canadian Tire. They currently have a one on sale for $210.

https://www.canadiantire.ca/en/pdp/moto ... p.html#srp

33 AH so it should last a few nights on DC (no Heated Hose or Humidifier)

Although undesirable to use, it does have a traditional 120 AC inverter, until you get your DC-DC converter.

Dog Slobber wrote: ↑

Tue Jan 14, 2020 12:51 pm

Your best bang-for-the-buck is definitely a scooter battery, but then you will also need a battery tender and a box.

I bought a power-station at Canadian Tire. They currently have a one on sale for $210.

https://www.canadiantire.ca/en/pdp/moto ... p.html#srp

33 AH so it should last a few nights on DC (no Heated Hose or Humidifier)

Although undesirable to use, it does have a traditional 120 AC inverter, until you get your DC-DC converter.

Yeah, the CT one would work too, but after 15% HST and the $60 to get the knock off DC adapter from amazon.com, it's gonna be $300. *sigh*

There is a DC adapter from amazon.com that will cost about $30 CAD, but it would need a 24V outlet on a battery. Not sure if there's an inexpensive battery with 24V outlet either.

This is why I still haven't bought a battery. It's proving to be very expensive. Even with a scooter battery, I'd still need the $60 DC adapter, the cig lighter adapter, and some sort of trickle charger or something to charge it with.

Does anyone have experience with the maxoak and it’s claimed usage rate?

N10sive wrote: ↑

Sun Jan 26, 2020 11:13 pm

Does anyone have experience with the maxoak and it’s claimed usage rate?

plenty do, but why throw away so much money?

palerider wrote: ↑

Mon Jan 27, 2020 12:22 am

N10sive wrote: ↑

Sun Jan 26, 2020 11:13 pm

Does anyone have experience with the maxoak and it’s claimed usage rate?

plenty do, but why throw away so much money?

Is there a cheaper better alternative with claimed usage rate and not that heavy?

I routinely go on ski hut trips for 3-7 days with no access to any power and most you haul your gear in. This solution seemed the best fit.

N10sive wrote: ↑

Mon Jan 27, 2020 3:09 pm

palerider wrote: ↑

Mon Jan 27, 2020 12:22 am

N10sive wrote: ↑

Sun Jan 26, 2020 11:13 pm

Does anyone have experience with the maxoak and it’s claimed usage rate?

plenty do, but why throw away so much money?

Is there a cheaper better alternative with claimed usage rate and not that heavy?

I routinely go on ski hut trips for 3-7 days with no access to any power and most you haul your gear in. This solution seemed the best fit.

A 25lb 35ah lead acid battery will give you 5 nights or so without humidity. it offers about 430watthours of power.

Compare the light lithium cells to that. ignore their outlandish mah claims, divide those by 1000 them multiply by 3.7 to get watthours.

palerider wrote: ↑

Mon Jan 27, 2020 6:40 pm

N10sive wrote: ↑

Mon Jan 27, 2020 3:09 pm

palerider wrote: ↑

Mon Jan 27, 2020 12:22 am

N10sive wrote: ↑

Sun Jan 26, 2020 11:13 pm

Does anyone have experience with the maxoak and it’s claimed usage rate?

plenty do, but why throw away so much money?

Is there a cheaper better alternative with claimed usage rate and not that heavy?

I routinely go on ski hut trips for 3-7 days with no access to any power and most you haul your gear in. This solution seemed the best fit.

A 25lb 35ah lead acid battery will give you 5 nights or so without humidity. it offers about 430watthours of power.

Compare the light lithium cells to that. ignore their outlandish mah claims, divide those by 1000 them multiply by 3.7 to get watthours.

The lithium is 20 lbs lighter but twice the price and roughly 300watthours. It's about $150 more for the lithium(after power supply, battery tender, box etc). Weight is my biggest issue. Packing in 5 nights of food, gear, sleeping kit, etc and additional 20lbs is a lot.

N10sive wrote: ↑

Mon Jan 27, 2020 7:35 pm

The lithium is 20 lbs lighter but twice the price and roughly 300watthours. It's about $150 more for the lithium(after power supply, battery tender, box etc). Weight is my biggest issue. Packing in 5 nights of food, gear, sleeping kit, etc and additional 20lbs is a lot.

Well, you'll need *two* of the lithium batteries for your 5 nights. unless you also pack in a solar charger.

I'm heading to Africa later this year for a photo workshop. So I bought an OmniCharge 20+ for camera stuff. According to the power supply for my Aircurve 10, it needs 24V & 3.75A. I can set the DC out on the OmniCharge to 24V and 3.8A. This $16 cable on Amazon https://www.amazon.com/gp/product/B07RF ... L1K3&psc=1 should let me connect the battery to the APAP. Is that really all I need to do? I mean, it might not have enough juice to last all night, but that's a different issue. And I'll experiment for sixteen bucks. I just don't want to damage the Aircurve.

Thanks!
-Seth

If you have Ryobi 18 volt cordless tools, they make an inverter that will take their 18v batteries to provide 150 watts AC power.

(EDIT: ResMed has some conflicting guides on using inverters. The Ryobi 18 volt battery inverter uses a modified sine wave and has a continuous power rating of 150 watts. According to ResMed’s Travel FAQ, the AirMini, AirSense 10, AirCurve 10, Lumis and S9 machines are compatible with these specs. Older machines are not. I can’t vouch for other manufacturers so avoid this as a solution unless you can confirm what they support).

Another item I have on hand that I bought for emergencies is an Anker PowerHouse. It's not cheap, and I debated heavily on spending as much as I did for it, but it saved my bacon when Hurricane Florence struck and we were out of power for over a week.
https://www.anker.com/deals/powerhouse2

My only regret with the Anker is that the PowerHouse isn't compatible with a solar charger (EDIT: technically it is, but the one they make for this isn't sold in the US for some reason. It can be gotten off eBay though). Goal Zero is an alternative that makes similar high capacity lithium ion batteries and they have solar kits available. If I was shopping today, I'd be looking at these instead.
https://www.goalzero.com