Thanks FmC. That is nice to know. Cheers mate!
My full update below:
Ive had no issues with the driver. With my resistor mod, input amps is 2,7A @ 12V and 2,9A @11V (11v divided on 4 cells means 2,75v on on load) when tested with a powersupply (should roughly give efficiency around 80% or a bit lower). I did not think up towards 3A should be an issue for the springs in the carrier.. Yet, when I did some startups with some unprotected NCR18650PF cells at around 3,3V there were some issues. It started with full output, but very quickly showed some strange behavior with the output. I took out the carrier and the bottom of it was burning hot.
Springs had "sagged" a bit. Typical issue if they are seeing too many amps.
I replaced the springs and added some 22awg wire too them. Tested again. Battery carrier got really hot in a short time.
Top of the carrier is easy to disassemble. Nothing to see there. The bottom end is not supposed to be opened. I used a hot air gun on the stuff that was inside the screws in order to screw them out. Here is the battery carrier bottom side.
Notice component at the far right. Not sure about the component at the far left.
Here is a picture of the electronics in the tail:
Not sure what do do know. Sup/Acebeam can sell me a new carrier. Price is not bad considering all the components on it. (20$ + a little bit in shipping)
Im considering to just get a new carrier instead of trying to replace parts in mine that may be broken or damaged. And then just mod the driver back to stock....
My light works nicely otherwise. Ive been using it outdoors a bit the last two nights. Taking it for a walk and comparing with other lights. But im not a fan of a light that seems to have issues with low voltage cells. Im not a fan of using the built in charging system when Ive got some components that look like they do.
I wonder if the electronics in the battery carrier is not up for the task of increased amps when cells get low, which naturally increases amps more in a regulated light like this.
Electronics gurus, feel free to share some insight and knowledge.