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.
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, ....
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!
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.