Thanks HKJ, as always, a great review.
I like the LiFePo4 for the increased safety of the chemistry, and also the lower voltage makes the hotter lights run cooler. I carried one LiFePO4 in my DQG Tiny III for about six months, worked great with negligible light lost to the lower voltage regulated driver.
Now with cheap affordable chargers like the LiitoKala Lii-100, LiFePO4 seems to be a great option for LiIon newbies. Safer chemistry, lower output/heat and you get used to rechargeable batteries…
As an example, the BLF 348 gives more light on 10440 LiFePO4, than an alkaline. But with much less heat than the 3.7V 10440’s. A great compromise in a small light…
Thanks again HKJ for all your testing…