NiMH rule for Fenix on Turbo, and Malkoff

[etc]

I haven't used Alkalines in a year, not once.

My favorite choice is Maha Powerex although I use the Eneloop in many devices.

I noticed that the Malkoff mod runs somewhat better on NiMH - both brighter and longer. Elektrolumens also runs much better on NiMH.

Having said that, I keep lots of Alkalines in all sizes just in case.

 

[mdocod]

your observations hold true in almost all circumstances with flashlight use. The only time an alkaline will match or potentially beat a NIMH in runtime is on a very low output light that has a power source who's voltage has to be bucked to the Vf of the LED. A D size alkaline could theoretically deliver as much as like 15AH or more into a very slow drain, which could equate to pretty good runtimes on say, a 2 lumen emergency light.

I do the same as you, keep a stash of fresh alkalines, and a few lithium primaries on hand for emergency backup, and cycle NIMH and li-ion in everything that I use routinely.