I carry spare CR123’s on my guns, in my truck, at work and here at the house. My EDC flashlight uses them as do my weapon lights.

But I’ve also got a few lights that use the 18650 rechargeable batteries that can still use CR123’s if needed. I’ll always have both cause 2 is 1…

And I have an auxiliary power unit that can plug into my Wraith or my scanner if needed.