Low Batts!

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Oft repeated in these pages, I'm Old School.
My first police flashlight (from John's Uniforms, of course!) was a 3-D cell Kel-lite. (1974?)  And the first 'tactical' technique I learned was to hold the flashlight with my weak hand straight out to the side from the shoulder.
The idea was if fire was sent toward the source of the light, it wouldn't be toward the center-of-mass.  (Questionable, anyway,  for a lefty like me!)
Shooting was still accomplished one-handed.  Not a very solid shooting platform.  And difficult to move down a dark, narrow hallway.  (I've since adopted better tactical techniques!)
Sadly, eventually, the D dry cells leaked, and I tossed that flashlight away.  Subsequently, I found out the switch mechanism could have been repaired.  Oh, well.
I now have a 3-D cell Mag-lite.  As I'm no longer performing private security, it's standing on the floor, adjacent to my night table.  But, it's rarely used.  And dusty.
My go-to flashlight is a Streamlight Scorpion.  It sits on top of my night table, right near the drawer wherein the Bob Hall Signature Model 1911 lives at night.
Small, handy, and rubber-coated, it's getting worn after it was purchased in 2004.  It runs on 2-CR123A lithium batteries.
It's not as cool as the $100+ tacticool flashlights in the same size, but, it works, and was only $35.00 at the gun show!  I bought a second one for my then girlfriend, who still carries hers in her purse (with her Nighthawk, of course!)  Can't be too careful.
If you're familiar with lithium batteries, then you know they are not like the traditional dry cell.  Dry cell light begins to fade, warning you might have a few minutes of illumination left.
Lithium batteries work great-they they don't.  Boom.  No warning.
So, I always try to keep a few batts in reserve, because, when they fail, it never fails, you need it.
I recently went to Battery Junction.com and bought 2 boxes of 12 CR123A batteries, as I was getting low.
One box for me, one for the ex-g/f.  She uses hers mostly to locate keys and other flotsam/jetsam in the deep recesses of her purse.  So, she uses more batteries than I do.
My one complaint is on level surfaces, the flashlight is apt to roll.  I need a square rubber washer (or something) to stop it.  (Looks like the newer models have an octagonal gizmo-good for them!)
Other than that, it's great!
FTC - no funds were exchanged.  I purchased the flashlights and batteries retail.  Good day!