FriendOfTheBlog(tm), Joel, had himself a bump-in-the-night encounter a few weeks back that I mentioned here. I mentioned it because it underscores the utility of weapon-mounted lights and how, in some circumstances, they are just what the doctor ordered.

What I didn’t mention was that I gifted Joel one of these so that he could light something up without pointing a carbine at it, if he needed to. We all know the rules about not pointing a gun at anything you don’t want to destroy, so I figure that a high-capacity-intensity flashlight would be handy for when you’re not sure that whatever is out in the dark is something you want to be pointing a loaded gun at.

Anyway…

There was a comment in the post Joel made about how, given his hermit location, finding CR123 batteries for this light, in case its rechargeable batteries zonked out, would be a difficulty and he would be better serviced with the dirt-common alkaline AA-batts. I politely disagreed because, in my experience, every Home Depot, hardware store, gun store, and supermarket carries CR123 batts.  But..I’ve been wrong before, so I’m open to the possibility that perhaps my experience in the matter differs from what that experience would be if I lived in Joel’s neighborhood.

But the crux of the matter, really, is this: is a device that runs on CR123 batts a liability over a similar device that runs on AA-batts? In terms of price? In terms of availability?

One of the points brought up in the comment was that AA batts were cheaper than CR123. This is quite true. But, as I pointed out, it’s not an apples-to-apples comparison. AA alkaline batteries are cheaper than CR123 lithium batteries. But when you compare AA lithium batteries to CR123 lithium batteries, there is a niggling difference in price. A quick perusal of Amazon showed Energizer lithium AA’s and lithium CR123’s being pretty close to each other in bulk price.

The scarcity issue may have some merit, but CR123 batteries are easily ordered in bulk from Amazon during a time of non-apocalypse, and because of their lithium construction they can be stored longer than alkaline batteries with less self-discharge. (And, I am told, lithium batteries tend to puke all over themselves much less than the alkaline batteries do.)

The advantage to the AA-batt is that if you run out of lithium AA’s for your device you can, usually, still use the dirt-common AA alkalines….assuming its not eight years after the apocalypse when they’ve all self-discharged or leaked into a pile of crud.

All of this underscores that for your battery needs you need to think about things like this. I standardized a long time ago on three battery sizes – AA, D, CR123. Almost every device I could possibly need….headlamps, flashlight, gun sight, weaponlight, radio, freezer alarm, etc…can be had running off one of those types of batteries. Some devices, like a high-intensity weapon light, have power requirements that can’t be met with anything except a CR123. While there are weaponlights out there that will run on other battery sizes, it seems like they usually don’t have the same level of brightness intensity unless they make up for their non-CR123 power requirement by using a much larger quantity of batteries. (In other words, instead of using two CR123, it may need six or eight AA’s.)

Then there’s the matter of rechargeable devices. More and more stuff is of the USB-charger variety. The flashlight I sent Joel, for example, has its rechargeable battery charged through USB. I rather like this feature because it means in a pinch I can charge it from anything that would charge a cellphone….a small solar panel, a battery pack, etc, etc. But, as we all know, rechargeable batteries have a limited amount of duty cycled before the battery starts to no longer hold as much of a charge. This is mitigated a bit by the fact that the package I sent Joel has a spare battery and should, I would think, last probably the rest of his life. But even if the batteries died an ignoble death, the light can still run off CR123’s…which brings us back around to a few paragraphs earlier.

The person who commented on there being a disadvantage, in Joels case, to the CR123 batteries has a valid point – resupply is definitely a concern. But, in my opinion, that potential risk or failure point is mitigated by the the CR123 being able to be long-terms stored meaning that a supply of them purchased now should take care of things. Also, for what I was looking for – a compact, handheld light with tremendous brightness – wasn’t as readily available in a non-CR123 version while still meeting the compact requirements.

Anyway, some food for though there.