My 21700 battery was on the way but I’m not sure 21700 can put in my Lii-500 anyone try it ,Any other charger can charge 21700 without cost too much ?
I can charge Lii-40A in Zanflare F1, though the fit is tight. Can’t say if that charger will work with other batteries.
Foursevens Flex will charge any 21700.
You mean charge 21700 in Zanflare F1 flashlight ?
The C4-12 should be fine. MiBoxer claims their charger is suitable for the new cells. Costs would be around $ 30 - 40.
I think he means the Zanflare C4 charger perhaps…
Indeed. :person_facepalming:
I hardly managed to get those protected Acebeam 18650s into the C4. I never thought it would be possible to squeeze 21700 into it.
The upcoming MiBoxer C8, an 8-bay version of the C4 series, is designed with the 21700 cell in mind.
8 slot seem to much for my need , Anyone try Lii-500 ?
Protected 18650 tend to be about as long as 21700.
The SkyRC MC3000 should fit 21700 right?
As a last resort you could always use an 18650 charger with wires from each bay to a 21700 holder, should be easy to rig something up. The charger won’t know the difference.
I can try tonight in Lii 500 and Zanflare C4 but I don’t know which brand do you have 21700 so maybe your will be a little longer or shorter… Don’t know how much it will helps to you…
Thanks vidramon the one I order was this https://www.aliexpress.com/item/-/32855373702.html?spm=a2g0s.13010208.99999999.344.292a3c004apcbz
Unprotected 21700 is fine. Acebeam 5100 mAh doesn’t fit.
Same goes for the Lii-500 and Esyb E4.
Unprotected 21700 is fine. Protected button top Acebeam 5100mAh doesn’t really fit but still makes contact and is able to charge.
I remember that I was charging my 21700 but not sure if I use lii 500 or F4. I will check and post back to you results and dimensions of the cell.
SkyRC MC3000 is too much cost for me , hope Lii-500 fit as maukka said my cell is unprotected 
My longer 26650 batteries measure 26700 and my Lii-500 has about 2 mm to spare so it should work OK.
21720 would be pretty tight.
I would suggest starting your search here: Round cell charger index
Click twice on the battery length column.
I test in couple of chargers, but 20700 battery, the length is the same so no problem in that way.
From left to right : Samsung 30Q, Protected Xtar 18650, Sanyo 20700.
Protected 18650 :
Sanyo 20700 :
Lii 100 - no fit
Lii 202 - will fit very very barely ( I do not recommend ! )
Lii PL4 - will fit without no problems
Lii 500 - will fit without no problems
Zanflare C4 - will fit without no problem ( less space stays than on Lii 500 and Lii PL4 )
I have more chargers but they are 500mA max and I don’t test in them since this is slow charge for this kind of cells.