I started going through changing the batteries in my sights and lasers yesterday and was wondering how often others change batteries. I try and change mine out every year to keep them fresh as you never know when you might need them.
When they get dim
That is very true, many just go from pretty good to nothing. The only one I really worry about is the RMR on my XDm OSP. It gets changed before it dims. All the others can crap out if they want to, I have batteries in the range bag.That used to work well. But now with more advanced circuitry and voltage regulation
they just die. No warning. No dimming. Its supposedly not safe to discharge a lithium battery so they cut off before they are dead. Most of my weapon lights use cr123 lithium.