The LED’s are on seperate mcpcb’s in a series.
So, it’s not using a single series MCPCB?
Seems a bit inefficient in terms of labor cost, and a chance of failure.
Wait!
Is there a possibility that the LEDs are simply not wired correctly?
A boost driver does not work if the input voltage is higher than the output voltage.
With 2 cells, the max battery voltage would be 8,4V, above the forward voltage of even massively overdriven 2S SST-20s.
When it first comes on with one cell, they all light up. The power switch is blue. Within 10 seconds it begins blinking red, the LED’s flash 3 or 4 times and shuts down completely. The light will not work at all with 2 cells. Nothing.
Precisely!
That means either the MCPCBs are wired incorrectly, which should not be too hard to fix. The driver would see that with one cell, the LEDs can still be lit up without any problem.
With 2 cells, the driver sees that there is a case of overvoltage, and shuts down quickly.
So doable to fix for anyone with a soldering iron.
Or the driver is faulty, which would take a lot more time.
Mine did all these things as well and didn’t work on 2 cells either. I seen the flashes and off as well as the red on the switch. If you’ve already cleaned contacts try going into other mode. Also try other batteries. I tried all different things till I got it working.
It seemed like it was in a programming mode or something.
I did get it to work with one cell for a short period of time maybe 2 times. As soon as I broke the contact/voltage ist started the same thing over. Worked once out of a weeks worth of messing with it. I did try different batteries. Got it to work once with the tail spring removed and magnet stuck to the negative side of the battery.
Never looked at it that close I will check them tomorrow afternoon.
Stuff like this is why I don’t buy Haikelite. I was really hoping they would improve their reputation on newer models. Seems not. :weary:
I have 10 or so Haikelites. This one is cheaply made, quite the dissapointment. Of all the others I have this one doesn’t even look like their work. The Q30 is the same way. Appearance is just different, just seems as though they put their name on someone else’s light. At least Banggood refunded my money. Maybe I can at least get it to work in the future.
I will get BG to contact HKL asap.
Freeme code please for haikelite sc04 thanks in advance
Im interested
Interested! (in CW sand color) Thank you.
Same here. Code please.
Interested for a Gold / 4000k version,
thanks!
No info on GB?
I do not think that GB is needed right now. The HaikeLite store has a good promotion by the end of March, which I used myself.
They even have a host version. Driver diameter is 28mm 
Ok Blue. Edited.
Don’t post links like this in a GB thread…
interested
Their discount is really good. Do support their new Aliexpress store!