What’s the best 10440 ion battery to use in the BLF 348? Thanks.
I find that I prefer running this particular flashlight on NiMH batteries (AA AAA Eneloops). 
Seconded. I run all of mine on 800mah eneloops
how much runtime are you guyz getting from those eneloops?
I have decided that Li-ion runs too hot in this stainless-steel flashlight. If you try it, you risk overheating the emitter, and by the time that happens, the stainless steel will have stored too much heat. The flashlight may not cool down fast enough after you turn it off to avoid getting damaged by the heat.
I have not timed the BLF-348, but my impression is that it stays in regulation for about 45 minutes or longer, and then crashes. Once it starts dimming, it fades quickly. As stated, I have not timed it, so I could be off by a lot. I am using an Eneloop battery.
Right now just been using some old fashion zinc chloride batteries (normally called “heavy duty”) because they were free from HF and I need the graphite rods from them. What I would like to try is some LiFePOs as they may run a little cooler than lipos being only 3.2V but still offer a nice boost in output, not that it needs it for how I use it. These are the only ones I’ve seen so far.
+1