Shargeek Storm 2 Battery Review

General Discussion on any topic relating to CPAP and/or Sleep Apnea.
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loggerhead12
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Shargeek Storm 2 Battery Review

Post by loggerhead12 » Mon Sep 19, 2022 4:30 pm

A recent stay in a condo where the power went out every time it rained has convinced me that I need to find a battery solution for my CPAP travel rig. Not sleeping is just not an option, especially on a tropical island where it rains every night! I also want to be able to use my CPAP on an airplane whether there is a plug under the seat or not. It's good to be energy independent.

I just got a Shargeek Storm 2 battery charger (https://www.shargeek.com/products/storm2) to use for work. It's primarily used for recharging just about anything with a battery - phones, hot spots, laptops, cameras, etc. For such a tiny form factor the thing carries a lot of power, reportedly 25,600 mAh (25.6 amp hours) or 93.5 watt hours. It'll charge your phone six or seven times or a Macbook Pro once. That's a lot juice for a portable device, but it's under the FAA maximum and is safe and legal on airplanes. I found it at Amazon for $229 - https://www.amazon.com/gp/product/B09NY ... UTF8&psc=1.

The Shargeek has a fantastic LCD display with tons of information on it, just the thing for electricity geeks. It's also in a transparent case, which does absolutely nothing except make it attractive to people like me.

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It's tiny, but solid at just over a pound. The weight isn't insignificant in a backpack, but it's not terrible either. It has USB inputs and outputs for just about anything you want to charge.

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What caught my eye is its DC output, which is configurable from 12 to 24 volts through a DC5525 port. That's right in the sweet spot of what the Resmed DC-DC converter wants to power the Airsense 10 line, including my AirCurve VAuto. Theoretically, given its watt hour rating this tiny battery pack could power my CPAP for over 8 hours over the pressure range I use, which is 14-ish to 17-ish.

After a quick search on Amazon for a DC5525-to-5521 adapter and a DC5521 accessory outlet (i.e., an automotive cigarette lighter-style plug) I made one of these:

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I plugged the new Amazon cable into the Shargeek, plugged the Resmed DC-DC converter into the Amazon cable, turned it all on, and the Resmed powered up! It was very exciting until I took a couple of breaths, then the VAuto powered off hard. At that point I was already writing the experiment off, but then I noticed that just before the CPAP cratered, the display on the Shargeek showed that it was trying to pull 16 volts. Using the menus on the Shargeek, I changed the DC output from 12 volts, which is the default, to 18 volts and gave it another shot. Sure enough, now I could breathe continuously and the VAuto stayed on.

The next step was to try it out in actual battle. Time for a nap. The VAuto used 15 percent of the Shargeek's battery in 80 minutes of use. A little math shows that the Shargeek Storm 2 will power my VAuto for over 8.5 hours, which is plenty for my purposes. It will provide enough power for a whole night or certainly an airplane ride. The Shargeek is designed for deep-cycle discharges, which means you can take it down to 0% charge repeatedly without damaging it. This might be the battery I've been looking for.

Here's what it looks like powering the CPAP:

https://www.youtube.com/watch?v=Ys0_X167fx0

antjessop
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Joined: Mon Oct 10, 2022 4:10 pm

Re: Shargeek Storm 2 Battery Review

Post by antjessop » Mon Oct 10, 2022 4:12 pm

Can I ask why you went through the DC to DC converter instead of just setting the battery to output 24v?

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antjessop
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Re: Shargeek Storm 2 Battery Review

Post by antjessop » Fri Oct 14, 2022 4:32 am

Excuse my ignorance. Having done further research I've discovered that the power supply is a bit more complicated than a standard DC cable and barrel connector.

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tyrinryan
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Re: Shargeek Storm 2 Battery Review

Post by tyrinryan » Fri Oct 14, 2022 10:49 pm

Any thoughts on why the resmed DC to DC power supply required 16 volts from the Shargeek. I thought it was supposed to work off a 12 volt battery.