Can you run lights off of a battery?

A few weeks ago, I was asked to demo out some pack lights on the outside of a building.I kept one of the lights in the wall pack.I cut off the mogul screw exposing the hot and neutral wires and attached a ground and a piece of SO cord with a cord body so that I could run it off 120v AC but I noticed it had a sticker saying the light runs off 38-42v DC at.7Is there a way to run the light off of a battery and still have it in a hiking bag?I want to use the light to take good pictures at the entrance of John's cave in Georgia.

I don't think putting a bunch of batteries together would work because the Ampere would exceed what the light is rated for and burn up the LEDs quickly.

I won't be able to power this particular light with a battery because the control electronics are embedded in a rubbery tray and it's impossible to access the downstream side of the transformer.Steve should stay out of it.You don't know how the real world works, go back to your desk job.

I'm going to get a small generator and use it to power the light without the need for a transformer.

The control electronics should be in there if you can connect to the power supply downstream of the AC to DC hardware that converts from 120v to 38v.

You could get rid of the original control board if you wanted to.The best lumens per watt and boom, done, if you dial in the voltage and amperage.It's easy to find boost converters on the internet.The corded power supply that my son and I built is powered by our electric tractor because it plugs into his corded string trimmer.It's easy to do.

You are a bad person.You can't ask basic questions about electricity when you're a 1st day electrician's apprentice.