In standardizing on a battery type, you should consider more than just flashlights. It is helpful if batteries can be swapped among your headlamp, flashlight, GPS, camera and or water purifier, etc. When out hiking or biking, I typically have a GPS, a headlamp, and EDC flashlight, all of which can accept lithium, rechargeable, or alkaline AAAs. Depending upon the need, I have lots of backup batts....