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Here's the problem with RCR123s and 16340s, in general: they have shit for capacity.
Since most of us use them in seriesat least for most RCR123 apps, it's 500-600 mAh only. We use them in series to compound voltage and to fire up the emitter, but we don't get to compound capacity.
This might not be an issue for a hack like me, where if I use turbo for no more than 3-4 minutes per day, but if you're Tier 1, 20 minutes at 500LM, probably won't cut it.
16650s in that scenario.
Chris
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What he said.
From https://www.surefire.com/product-education/battery-safety/
" ONLY USE rechargeable LFP 123A batteries in SureFire LED illumination tools designed to be powered primarily by disposable 123A lithium batteries, and use only those rechargeable batteries sold at surefire.com or from an authorized SureFire dealer, as these rechargeable cells are expressly for use in high-drain devices like SureFire flashlights and WeaponLights.
DO NOT use rechargeable LFP 123A batteries in incandescent illumination tools; the initial elevated voltage after charging may burn out or break an incandescent lamp's filament."
I run a SF LFP123 in my 3V Aviator for the reason stated in that too. I *may* have tried charging the SF LFP123 on the Fenix charger I use for 16340, 16650 and 18650 batteries, and I have had to return that SF light for warranty repair, after burning out the LED.
The SF LFP123 are also a bit narrower than some other 16340 batteries: I can't fit a keeppower 16650 or a pair of EFest 16340 in my old A2 aviator lights.
I do run 16340, 16650 and 18650 batteries in my other surefires, those that are hosting a Malkoff M61 or M91 LEDs.