That stinks! I’ve been there before:(
No kidding wait a month for the arrival of a new toy and this crap happens. I would like to know for sure if it ruined my battery though. What do you think?
Wow i have never seen that happen where the spring is stuck on. Yea the light is dead. You should be able to clean the battery up?
The spring welded itself to the cell, awesome!
Just replace the spring and check the circuitry and try again?
Does the battery still have voltage? If the voltage is 0 your charger might not activate charging. You might need to zap it back to life but be careful! Connect it to another battery for 15-20seconds or directly to another voltage source. You can even connect it to a 12v batter just for 2-3seconds at a time. But I may get scolded for suggesting this :disguised_face:
Your light may still be ok but you will have to do some diy work. You need to find where the short origionated. Look at the spring by the driver and see if it is somehow connected to the retaining ring or to ground on the driver. Oh… and you’ll have to replace that spring:)
I made the video for banggood we shall see what they will do to make it right. I’ll try to figure out how to fix this one but a replacement would be ideal regardless.
If this is a 18650-30Q the battery will be fine, the cell can deliver enough current for a short amount of time to melt a spring.
Modern FET lights push a lot current through the springs they can get very hot
Check if there is a short circuit on the driver
Best for efficiency and safety is a spring bypass
Steel springs can have 0.3V drop at 3A
Bronce alloy springs 0.1V at 3A
A bypassed spring has about 0.01-0.02V @3A
Toasty!
Nice to see those steel springs actually serve as current limiting protection devices. LoL! 
Its really disgusting (imho) to see a video filmed in portrait 9:16 aspect ratio. Please, film clips in landscape mode. Thank you. :-)
Cheers ^:)
Its quite likely repairable with simple soldering skills Shorts often bypass both the driver and led leaving them undamaged. Probably need to replace both springs as the temper is lost when over heated, possibly the switch as well(switch assemblies are available drop in ready).The short will be in the head end(tail shorts just make the light come on but don’t cause over current). The head retaining ring is right hand thread, tail is left hand thread. Remove the pill by unscrewing it with scissors or needle nose leaving the retainer in place for now. It’s quite possible the reflector shorted to the metal core printed circuit board the led is mounted on, there would be discoloration on the plus pad and underside of the reflector. If these appear clean then the short would be from the driver to the pill. To inspect that you need to desolder the emitter wires and undo the retaining ring to pop out the driver. Both kinds of shorts occur but odds favor the reflector short. It’s an easier fix sometimes not even requiring any soldering, just shaving excess though in your case at a minimum the driver spring.
The reflector is probably sitting on a solder joint causing the short. The good news is you can pop the switch out of just about any small light (Convoy C8, S2, S2+…) and put it in that light. Or you can order one from mtnelectronics. The driver may still be good…a lead probably desoldered itself from the driver.
Ok cool thanks for the responses guys. I’m at work now but when I get home I’ll do some detective work keeping in mind your suggestions. I’ll probably have questions and add pictures if I do. Thanks again.
Reflector shorting on the led board's solder points has an easy fix with a dab of hot glue.
Speaking of which, my kitchen lamp also needs a few dabs of hot glue here and there. As it is now, if you are to dare to look up and stick a finger in the wrong place, you may get a 100V zap! 
Of course, you may need a solder mask to do that. :STEVE:
Cheers ^:)
Did those photos even show up? O well. How do I get the reflector out? I want to just bear down but afraid something may go crunch.
Yeah, they showed up. I’m pretty sure that reflector is threaded so it should unscrew counter clockwise.
Somehow +B shorted to -B… Venturing a guess the +B wire to the emitter shorted, or +B solder blob on the MCPCB shorted to the reflector.
I’ve placed an order at mtn for 2 springs, a new colicky switch, silicone wire and some other goodies. Are you thinking the emitter could be ruined?
even short circuit the emitter to run just on the battery should be no problem for a short time its DD but not regulated
to melt the spring there must be higher currents so the emitter gets no current at all
Emitter should be fine. Driver should be fine also. Did the emitter even come on when you pressed play? In my experience the emitter doesn’t usually come on because all the current is earthed out. Because of the configuration of the driver in this light the positive end of the batt doesn’t get regulated through the driver. Hense the driver get out of jail free. And the weakest point melts. SPRING in this case. In my experience the switch acts as a fuse and melts.