Sorry to be absent for a long time, a lot of problems lately.
Perhaps the driver was overheated, and some components left their nominal values, so it does not work now from 12v.
To find out, you need to remove the compound and take some measurements, but it will be difficult and I’m not sure if this will help you.
It looks like in this photo we see a driver power of 35 watts.
This was the AD-DC version of the driver. The photo shows that there are no 2 diodes out of 4, and the remaining two diodes protect against reverse polarity.
And I was mistaken, I thought the battery pack consists of 6 cells (3s2p), but it looks like there are 12 cells (3s4p).
I took some measurements of boost converters.
1.
Input voltage 8.5-40v
Output voltage 10-45v
Output power is 250 watts.
This is a convenient version of the CC CV boost converter; it is assembled on an aluminum plate. It is similar to the MCPCB for the LED and it can be glued to the back cover.
I loaded it at 35 watts, and it works well in the range 8.5-14v. But it turns on very unstably at a voltage below 8.2v and at the same time it gets very hot.
If we turn it on when the voltage on the battery is 8.5-12v, it works fine and discharges the battery to 7.5v. But if we turn it on at a voltage of 7.5-8v, it can fail.
2.
Input voltage 10-30v
Output voltage 10-35v
Output power is 150 watts.
Good CC-CV boost converter with undervoltage protection. With an output power of 35 watts, it does not heat up, it works stably up to a voltage of 9.80v. At a voltage of 9.80v, protection is turned on, and the output power drops to 30-40%. Meanwhile, due to the low load on the battery, the voltage on it rises to 10.3-10.5v and the converter continues to discharge it to 9.80v.
But there are two problems:
1 Fine adjustment of output voltage required. The converter maintains a constant current, but if you set the voltage higher than necessary, it does not work stably.
2 It is also slightly unstable in protection mode.
from undervoltage. There is a slight tremor of light.
3.
The boost converter in your link is identical to the previous one, but it has no current regulation, only voltage regulation.
Most BMS battery boards have undervoltage protection at 2.5v per cell or 7.5v for three cells connected in series.
The first converter can drain the battery completely, and you will have maximum run time, but turning it on below 8.5v can burn it.
The second converter has some problems, and does not completely discharge the battery, up to 9.80v (3.26v per cell), but it is more suitable for you.
The third converter, I recommend you only if you have not found anything.
some links
https://www.tinytronics.nl/shop/nl/spanning-converters/step-up/dc-dc-verstelbare-step-up-boost-converter-150w-met-stroombegrenzer
https://www.tinytronics.nl/shop/nl/spanning-converters/step-up/dc-dc-verstelbare-step-up-boost-converter-150w