Convoy S21A (Short Technical Review)

Recently picked up one of these with the 12 mode grouping.

Seems that whatever mode I choose it will at some point in the future randomly reset to the first mode (ie. 0.1 , 1…blinkies etc)

I recall there being something about driver memory wearing out if left in config mode for too long (which i haven’t) but it makes me wonder if this is an inherent bug with the driver, or do i simply have a buggy item.

Any ideas would be welcome. Thanks.

pls contact me any time if there is problem with the driver ,my friend

Check Convoy S2+: the selected group is reset after battery disconnect

At present, the manufacturer has replied. This is because the mode group is not saved at the moment of power failure. At present, the manufacturer has fixed this bug by modifying the program.
If some users need me to mail a new driver after one month, please leave me a message,

Odd, the S21A has been on the market for a while, but I feel like I’ve only started reading about these memory bugs in the past couple months.
Was the manufacturing process changed at some point recently? I’ve got one in the mail, so fingers crossed that it doesn’t exhibit similar bugs…

Are you sure it’s power failure? The mode memory on mine has never been affected by opening the flashlight. It will just randomly reset at some point in the future. There does not seem to be any particular cause.

same for me, once per like month it will simply change mode group for 1st one

I dont know what cause it, as it happen very rarely

I have one of the new 8A buck drivers with 12 mode group firmware and I’ve had this happen once as well.

anyone can chip in whether there are any safety concerns when the bypass cable snaps?

Probably not. But, the light can be run at a lower level. I have remade the bypass with a larger wire due to this happening on some of my S21As, too. At first, I was surprised it happened because the stock wire looked ok.

I dont think so, you will just lose few lumens on higher levels

Is the SST40 of this review the 5000K version ? It seems like by the picture

Just got mine in, does anyone know of a clip that fits around the light and is captured by the tailcap?

In this style…

Click

It's the 6500K version

The Convoy S21A can be had with either the “4 modes” driver or the “12 groups” driver.
Link:
https://www.aliexpress.com/item/33026858558.html?pdp_ext_f={"sku_id":"10000012685260820","ship_from":""}&gps-id=pcStoreJustForYou&scm=1007.23125.137358.0&scm_id=1007.23125.137358.0&scm-url=1007.23125.137358.0&pvid=fbf2855a-361a-42fb-9ce1-6b7f0d8ee00c&spm=a2g0o.store_pc_home.smartJustForYou_650637087.0

In the “12 groups” driver instruction it is mentioned: “BTW, do not leave the light in config mode for long period of time, because it will wear out the driver’s memory faster.”

Does that mean that Convoy lights with the “4 modes” driver will last longer than those with “12 groups” driver ?

Thank you in advance.

Probably best asking in a thread that Convoy owner Simon posts in regularly about the driver ‘wearing out’.

1 Thank

yes, IF you plan on leaving the light in config mode… !

If you use it like a light and reconfigure it only occasionally I cant see you being able to see any meaningful difference in driver life

Cheers everyone!
Does anyone know what kind of thread is used in the tailcap to hold the switch in place? For a modification project I need to 3D print a part with the same thread. I’m from Europe so I’m not familiar with threads outside of metric threads. My closest guess would be ANSI 3/4-28 UN right now? Unfortunately, a test printed ANSI 3/4-28 UN created with Fusion 360 did not fit.
Thank you, Jan

No ideas?

I almost responded, but the info in my mind was for a emisar light.

I’ll be checking the s21 in a minute here at work

Edit: ok… .743 od on the brass ring. Kind close to 19mm if you ask me.

Also with my old eyes, it appears to be about .75mm pitch

And it’s left handed as well.

Start with that, 19mm x .75 pitch, LH.

I don’t know what’s common for metric, as .7mm pitch is also close