The BLF 348 is supposed to be able to accept 14400 cells
But I can’t find them other then a 4-pack **fire.
Is it worth looking beyond AE, Hearbest, Banggood and FastTech? And if so, where do I find good ones?
I don’t know about 14400’s, but THESE are some good 10440’s at fasttech. If you can charge 3.2V LiFePO4, they have them as well at FT.
Good luck!
14500 is what you’re looking for, not “14400”.
When it comes to li-ion cells, it’s a good idea to go for quality. Poorly made cells tend to have far less capacity and can even be a fire hazard. For quality cells try Mountain Electronics or Illumn.
If you’re looking for a battery for the BLF 348, then you’ll need a 10440. It’s the same size as an AAA battery. That light won’t fit a 14500. But just keep in mind, that when you throw a 10440 in that light, it gets extremely hot extremely fast. You’ll have maybe 20-30 seconds before you can’t hold it anymore. But it is bright, tho!
I don’t own a BLF348, but I’m not sure a 10440 produces enough juice to overheat a light.
Last AAA-size light I owned was a Fenix LD02 that I modded with a FET driver and XPL HI. On an IMR 10440 Output was extremely good for such a tiny light, but the battery ran out of juice before heat became an issue.
Biggest danger lights I’ve found are my modded small 18650 lights. My DQG Tiny III FET driver with triple XPL got burning hot around the head within seconds. So much so that to make it more useful I had to rig extra external heatsinking, plus insulation around the button. This made the light more useful, but also made it look like really ugly.
April Fools Right? I do own one.
Oh thanks
10440 is the correct thing
No wonder I could not find any (but what those 14400 **fire cells were ;))
And here I was, thinking that the “14400” was an April Fools joke.
I guess the joke’s on me! 
Hahaha yes it was a genuine mistake, I had been looking for good 14400 cells, so I fooled my self
When i use AAA battery on BLF348 it quite warm after several minutes, so when using 10440 is extremely hot.
I wish it got lo and med mode :-/
Efest 10440. By far the best available. *fires are junk.
How well the BLF348 can handle it, that’s another matter. Heatsinking isn’t good and since it has no med or low lode, so you must limit the runtime. In the BLF348 it’s more for showing off.
Yes when I read about the heat and looked at that small smooth stainless steel, I figured this is not ideal for higher currents.
It will take the 10440 for a couple minutes but it gets hot fast, and when that’s not comfortable it is time to switch off . Efest is best but mine also does fine with the Trustfire TR 10440 600 mA cells. Those are OK cells at a decent price. As expected 10440 is much brighter and gave no bad effects after trying them.
Phil
+1 
Efest IMR10440 is pure and simple top of the class.
That said, it’s ~3.3A capability to an XM-L2 in a small light will cause overheating issues in a hurry.
I highly recommend the NiMH Low Self Discharge AAA by Imedion. Thomas Distributing sells them here, but they can be found on Amazon and various other places as well. These are Powerizer brand, Imedion is their low self discharge chemistry that’s like an Eneloop only a little better.
i never heard of these, in what way are they better than eneloops ?
i saw on blf someone knew the best way to charge 10440s.
i lost the info. can someone tell me ?
thx in advance
I use a Cottonpicker’s 8 level USB charger, I can select to charge from 50 to 780mA for smaller cells. Charging at .6x the capacity is recommended, so a 350mAh cell does best when charged at 210mA, the 8 level Cottonpickers charger has a step at 200 so I use that for the 10440 for safest longest lasting cells. I also have 10250 cells, use 50mA for those as they have an 80mAh rating. But they can do over 3A for a little while!
An MC-0 isn’t a bad option. Two settings, 250 mA and 500mA. I use it for 10440’s and 14500 cells.