Xiaomi Power Bank as E-Skate Battery Pack?

Lightweight / Folding / Portable EVs - seats optional
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ferez21   10 mW

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Xiaomi Power Bank as E-Skate Battery Pack?

Post by ferez21 » Aug 31 2015 5:13pm

Hi,

Iv'e noticed you can get this 10,000mAh (5V) power banks pretty cheap:
http://www.banggood.com/Original-XIAOMI ... l?utmid=57
(Will be 11.99$ in a promotion next week).

Why not get a bunch of them (They also weigh only ~200gr a pack) and use them to power our boards?

EDIT: I believe there are 4 batteries like these inside:
http://www.dx.com/p/lg-lgabb41865-18650 ... eTgIFWqqko

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sl33py   10 kW

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Re: Xiaomi Power Bank as E-Skate Battery Pack?

Post by sl33py » Aug 31 2015 5:29pm

Doubtful this will work well...

It only powers items at a couple amps - so trying to utilize in series (to move from 5v which is likely regulated) to something we'd want like 24v+ would be a lot of work. Better to get some bare 18650 cells that can sustain high Amp output. Then do what others have done and make your own packs.

I've measured a pretty consistent (peak) draw of around 65A on 8s (33v). Just to compare.

Playing with it is one thing, but i really don't think these would work well, or you'd save $ just buying the bare 18650 cells and making your own pack.

GL!

chuttney1   100 W

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Re: Xiaomi Power Bank as E-Skate Battery Pack?

Post by chuttney1 » Aug 31 2015 5:39pm

As with what sl33py said, seems like a good idea until you look at the battery's specs on max discharge amperage. You will want to keep that in mind.

ferez21   10 mW

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Re: Xiaomi Power Bank as E-Skate Battery Pack?

Post by ferez21 » Aug 31 2015 5:40pm

I think it's even cheaper than 4 bare LG 18650 (which iv'e seen for 4$+ ech).

Anyway, in the meantime i have found another interesting battery pack to possibly replace my triple 12v 7AH SLAs (always looking for some):
http://www.banggood.com/DC-12V-20000mAh ... 76717.html

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sl33py   10 kW

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Re: Xiaomi Power Bank as E-Skate Battery Pack?

Post by sl33py » Aug 31 2015 6:15pm

Just remember that not all 18650's are the same.

Yes you can save $ and get cheap cells - but will they provide the Amps you need for a board pulling 50+Amps peak? If you solder these up and make your own packs with cheap cells and one dies...

I personally would make sure the cells exceed the draw needed, and get quality cells vs no-name cells. BUT i'm not quite to the "pack building" stage like others here. I'll stick with the known lipo challenges for now.

Let us know how your testing pans out and GL!

206monkey32   10 W

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Re: Xiaomi Power Bank as E-Skate Battery Pack?

Post by 206monkey32 » Aug 31 2015 10:55pm

I had the same thought bout the Xiaomi packs when i was getting into my first build about 8 months ago. When i looked up the specs of the cells xiaomi uses the amperage output isnt nearly enough for our use even if you did get them cheap.

ferez21   10 mW

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Re: Xiaomi Power Bank as E-Skate Battery Pack?

Post by ferez21 » May 26 2018 11:08pm

I thought the new Xiaomi powerbank uses 18650, but i was wrong, the 20,000mah version that cost less than 20$ is made of two 3.7v 10,000mah lipos - returning to the original question, you think we can somehow modify it (while eventually keeping them in their enclosures) so we can daisychain a few of them to create a battery pack for an ebike?

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