Convoy S21A (Short Technical Review)

I was asking because I needed to illuminate dark basement while working for few hours, so I was thinking about putting the flashlight into glass of watter to keep it cold, so it could run on turbo for infinite time

Could anybody tell me the diameter of the battery tube? I want to buy one shockli 21700 4550 22a/30a for the s21a that is coming but I think it will be too thick.

Thank you

I measured 21.48mm with my calipers. I use Samsung INR21700-48G which fit just fine.

Nice it has a true Constant Current FET driver, but a shame a 10% mode was sacrificed for a moon mode.
In fact, it seems all Convoy drivers have sacrificed a necessary mode for a moon mode, ruining the mode spacing.

Thank you Terry

Finally ordered 2 x LG21700 from Convoy.

Simon said that there will soon be a 17mm 5A constant current FET driver available with Biscotti.

Ah, now we're talking.

Finally got my first S21 from banggood this week. I don’t hate the 6500K as much as I thought I would, and I love this light. I EDC a Jaxman E2L, S2+, or BLF A6 in cargo pockets, and after a few days with the S21, it really doesn’t seem bigger for my carry purposes.

And the idea of a 5000mah 21700 with a full day of runtime makes me giggle as much as the throw of SBT90 in my new FT03S.

When there’s a version with a warmer tint and biscotti, I’m definitely getting another one of these. Ah, who am I kidding, I’ll probably buy more just like this when they go on sale again. Just an amazing deal for $17.

Sent out for an astrolux s42 lens from BG, and cleaned out Kiriba-ru’s spacers - can’t wait to quad this up!

Guess what… there are S21s with 5000K SST-40 and “12 mode group” (clone of Biscotti) UI: 13.68€ 29% OFF|Grau convoy S21A mit luminus sst40, kupfer DTP bord und ar beschichtete innen, Temperatur schutz, 21700 taschenlampe, taschenlampe licht|Taschenlampen| - AliExpress

You could probably also ask Simon to install and XP-L HI of your choice into the light as well. They match well with the driver, I swapped one into my S2+ with 5A/12 group driver and am enjoying it for a cheap beater light.

Maybe i got a dud, mine is only marginally brighter than my 1050 lumin Thrunite TN4A. Awesome review, thank you.

Hello guys, I have a question about Convoy’s 4-modes driver.
S11 with 4-modes driver, no strobe mode listed in the specification/description at AliExpress Convoy store, but some reviews on BLF mentioned it actually has strobe mode.
What about S21A ? Is it also 4-modes plus hidden strobe?

The S11 XHP50.2 driver manufacturer mistakenly added the double-click strobe function when producing a batch of drivers.
As a tool for daily use, I personally don’t like to add strobe to modes

Hello Simon, thanks for your reply.
I actually like strobe mode as a hidden mode, not in the main loop, not something like “low-med-high-strobe… ”.
I prefer “hidden strobe”. But I think double-click is too short, has the potential of accidental activation.

Your new UI of M21C-U has three-clicks for strobe, I think that’s good. Is it possible to add this feature to other driver, especially your 12-groups driver? Additional mode, strobe, hidden, three-clicks. Accessible from any mode group.

I understand that 12-group driver has strobe mode in group 1, 4, 7 and 11, but that’s in the main loop, not hidden. Not ideal for EDC/daily use.

I think hidden strobe is an ideal solution for user who doesn’t like/need strobe as well as for user who likes/needs strobe. It’s hidden, not prone to accidental activation, but still relatively easy to access when needed.

I have always wanted my driver manufacturer to write programs similar to crescendo, but I have been too busy recently. I think I will be free in a few days.

I don’t have experience with Crescendo but I read on BLF :
Crescendo has hidden strobe , and ramping, for flashlight with regular switch (not e-switch).

That’s pretty good!

Light painting photographers like strobes (single frequency strobes). They can be hidden as long as once selected they can be memorised! It is quite a big market, one light painter has over 300k followers on insta.

I just did a little more reading about Crescendo. It’s very good!
Simon, if you make Crescendo driver available for S21A and S21B that will be great.

There are no discreet brightness steps in Crescendo. As an optional UI, yes, but I would hope not the only UI available.

Yup, as an optional UI.
the Biscotti (12-group) is also very good.
It’s good to have options. People can choose what suitable to their need/desire.