You raise an interesting point. I would love to get one with an 18650 extender ($12 from dereelight I think?) so the runtime would be extended. Vinh is there another driver you could use to support this?
Deere-light driver pushed 1.5A-2A...Not so bright... but yeah long runtime.
I always found 30-40 minutes of spotting is plenty long. This light is not good for general purpose illumination due to the beam so spotting is really just on of on off type of a deal.