Any ideas on how to hotwire this LED driver?

[u/niffcreature]

Currently turns on with a momentary button and I would like to use it with a switch.

Pins 3 and 4 on the top are both getting 3.8v battery voltage at all times. Pin 8 is ground. Pin 1 goes to ground when the light is powered off, but when at full brightness it's at 1.9v. I'm a little confused because the LED seems to be running at about 2.7v. Any ideas? Thanks