21700 batteries that fit Convoy S21A flashlight

Protected cells are longer and slightly wider due to having to house an extra protection circuit and additional wrapping.

The Lishen will not fit.

Yes those will fit

I think I would rather have cells close to 5000mah instead of 4000mah. Otherwise I’m not seeing a big difference from my 3800mah 18650 cells. Convoy offers the S2+ in 18650 in almost the same brightness of 1800 lumens with the same LED as the 21700 option.

Do all the lithium cells have less capacity the more output they have?

There are no 3800 mAh 18650 cells.

BTW, as of June 2019, there are no 18650s with capacities of over 3600mAh.

Oops my nitecore 18660 is 3400.

Your nitecore 18650 has an exaggerated rating. Nitecore does not manufacture batteries.

I saw lots of mention of new 5,000mah 20A lishen and molicel 21700s in the convoy thread. I know they won’t fit the S21A but my zebralight sc700d can accept a 50E with triple wrapping, so they might fit perfect in there. Are those available for purchase yet?

Protected 18650s and unprotected 18650s may have a difference of 3-4mm in length.

Protected 21700 and unprotected 21700 may have a difference of 5mm in length.

Most flashlights that accept 18650 will accept both protected and unprotected 18650s, but not all (eg. Emisar D4, Astrolux S42, etc. do NOT fit protected 18650s).

Protected 21700 are still very rare, I doubt flashlights that are not designed with those in mind will fit them, because the springs have to accommodate 5mm length (there will be a lot of current drop, for flashlights that use high-drain cells, having the extra length will mean a big current drop due to the size, as per my understanding)

I’m waiting for a different LED on the S21A

is there a 5000k 217000 convoy S21a yet?

What would be the best 21700 for the Convoy m21a? Much appreciated.

What would be the best 21700 for the Convoy m21a? Much appreciated.

The Samsung 50E:

Thank you for the info and including the link. What makes this one the best?

Since the M21A/S21A will only draw 5-6A at max, you only need a cell that has 10A continuous current capability.

Hence, why I recommended the 50E, since it is a 10A continuous 21700.

Ordering now. Thank you!

Well Crap.

This explains why I can’t get my Sofirn labeled (Protected, I think) 21700 into the s21a that just arrived. :-/

Molicel P42A fits