Here’s some info on that led.
It’s basically a high amperage 3 volt LED. It can easily take 20 plus amps.
The best battery for that light will depend on how you want to use it. If you only use it a few seconds at a time and you want the absolute highest output (on Turbo), then you want to use a very high drain battery. It will pull the highest amps, but get hot very quick.
If you don’t really care about getting max output (on Turbo) and instead want it to run a little bit longer before getting hot, you can use a much lower drain battery. It will pull lesser amps.
This Samsung 40T is a nice middle ground battery.
The 30T will pull more amps.
The 50E will pull less amps.