Did my Convoy 3X21D just suddenly die? [TL:DR at the end]

Yesterday I got my 3X21D out to look at some trees outside at night and after having it on for like 5-10 seconds the light dimmed down to pretty much being off. I turned it on back again and the same thing happened. I noticed the power button/led indicator was red so I thought it was just low on battery (which was weird since I hadnt used it in a couple of weeks) so I just got my L8 out instead.
Today I woke up and plugged the 3X21D (which wouldnt turn on anymore so I just thought it was completely dead) and to my surprise after 2 hours it hadnt charged at all (it wouldnt turn on and power button was still red (not flashing or anything). I tried getting the batteries in and out and left it charging for like 8 hours and the power button was green this time so I though that was it but again it wouldnt turn on at all. After reading online I thought it might be that 10click lock mode and tried again but this time I was looking straight at the SBT90.2 LED when pushing the power button and noticed there’s like an ever so slight light coming out of the LED. Even when tapping turbo mode it’s only like 1 lumen - if you’re not looking straight into it you cant tell at all ._.
I thought it might be the moon mode but no, I’ve tried any imaginable button combination and nothing works. I have an external battery charger and all batteries show as 100% on it.

TL:DR My 3X21D won’t turn on the LED but to like 1 lumen (no joke) no matter what I do even after letting it charge for 8h and power indicator turning green.

Has anyone had anything similar happen? Is there anything someone with no eletrical/sothering experience can check any further?
If this is the end for me and my beloved 3X21D it’s gonna pretty sad cuz I didnt even get to use it much and it pretty expensive to get it to my country - and it is my favorite flashlight overall :frowning:

What voltage are the cells at?

Have you contacted Simon (the owner of Convoy)? He’ll likely be able to help you or replace the light.

have you checked your cells? what you’re describing sounds like a problem with the batteries, rather than the light.

I wonder, Are you using flat top cells with the adapter? Is it placed properly and are the contacts clean?
Regardless, When I have problems like that I always start out by cleaning every contact that I can access with a pencil eraser followed by isopropyl alcohol. This has fixed this sort of thing for me in many cases. Plus it is a quick and easy thing to try.

Also: If you have or can get some, also use some Deoxit contact cleaner… Use it after the above cleaning. It is not cheap but I love that stuff . It has saved me many times.