Quoted:


I bought a cheap AA flashlight (  fenix LD22 )



Fenix recommended using 1.2v NI-MH rechargeable  batteries to get the most out of my light?



Are they that much more powerfull than the  AA 1.5v litium or alkaline



what are the pros and cons?

Quoted:


The Alkaline's fall flat at higher power, but they can be had anywhere. Personally, I would not use them in any light that draws more than 500mA.

The non rechargeable Lithium Iron are ~1.7v-1.72v out of the box and are great for the high drain uses and for stow it and forget applications. Very pricey, though.


The Ni-MH batteries are good for EDC usage, especially with the Sanyo's (either their std Ni-MH or their Low Self Discharge Eneloops). Downside is the cost is higher upfront, as you need a charger, and you need to charge them every few months.