Surefire G2 LED Upgrade, and Why Lithium Batteries Rock

Why lithium batteries rock:

Tonight I replaced the old halogen bulb in a Surefire G2 flashlight with an LED conversion unit. The output is much brighter with a great throw. I checked the batteries in the flashlight and they are the original Surefire CR123A batteries, with a 2015 expiration date, which was 10 years from when they were manufactured. Yes, this thing is still functioning with 20 year old batteries.

This particular light lives on a nightstand and gets used very infrequently, which is why I haven't used up the batteries. But for them to last 20 years and still be useful is impressive, to say the least.

This is the LED conversion I used: https://amzn.to/4oaiHzv

To fit the G2 I had to remove the outer coil spring, after that it just dropped in.