Single cell 21700 powerbank?

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Mraz
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Single cell 21700 powerbank?

Hi.

Do you know of any single cell 21700 powerbanks? I searchedAliexpress and found nothing other than Nitecore “21700 Intelligent Battery System” wich is cool but at 50ish $ too much for something I don’t really need. Could work with single 18650 cell if it’s 3.5Ah.

I need a small powerbank that can charge my phone (2Ah) and edc light when I’m outdoors.

71k5
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Acebeam makes a model# ACEBEAM-IMR21700NP-510A-USB for $21.90, as seen here: ACEBEAM-IMR21700NP-510A-USB

I own one, and can confirm it works as a 5000mah battery bank. It also functions, but not internally charge, in my Olight Seeker 2 Pro.

Mraz
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I did a little digging and found few on AliExpress si problem solved.

helicoil
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Another option ...... Velleman VLE9 ........

 

 

This single bay charger has a slider that can accomodate Li-Ion cells upto 76 mm in length ... all you need to do is remove a little bit of the "housing", see right image ....

 

After doing that you can virtually use every single Li-Ion cell upto 76 mm as a powerbank with this charger/power bank device .....

 

Total cost about € 10,- and 30 minutes of DIY ...... simple, effective and for an unbeatable price (I think).

 

Also charges other chemistries but there is a minimal length for the Li-Ion cell ...... of 42 mm / 1,6 inch .... so 16340 is too short, as a powerbank also not worth much, ....

 

..... but anything from 14500 and up works fine.

 

Cheers,

 

Martin

angerdan
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Xtar PB2S with just one cell

D'AVerk
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“I need a small powerbank that can charge my phone (2Ah) and edc light when I’m outdoors.”

Sofirn HD20 Big Smile

Fescron
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D'AVerk wrote:
“I need a small powerbank that can charge my phone (2Ah) and edc light when I’m outdoors.”

Sofirn HD20 Big Smile

True hahaha, although I heard it can be a bit picky with the used cables. Mine worked just fine with everything I got though, it is indeed a very cool do-it-all light. A bit on the heavy side as a full-time headlamp and a bit awkward to hold as a full-time “regular” flashlight but it produces very awesome light!

d_t_a
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Nitecore F1 fits unprotected 21700 batteries, it’s a single-cell charger with USB out (powerbank) function. The package also includes straps to hold the battery in place when moving around.

The Folomov key charger can also function as a powerbank, but is not stable if using as a powerbank (when moving around, the battery may easily get dislodged)
https://lygte-info.dk/review/Review%20Charger%20Folomov%20Key%20Charger%...