Lazermax batteries - Lasermax Batteries Silver Oxide Fits Glock, XD

I left the original batteries in my Lasermax for my Glock 17 in for 6 years, and there was no change in brightness. I changed them just because they were so old, and I didn't want to take a chance if I might actually need it. I only shoot a couple hundred rounds every few months, but I was still impressed with the longevity. The only problem I had was the install. After playing with the spring for a few minutes, I decided to just try and pop off the red cap a the back. Bingo! With a simple instruction the battery change could have been done in less than a minute.
Pros: Cheap, long life
Cons: instructions

This review was written in the old system and had content requirements that are different than reviews written today.