FastTech has the 32650 Feilong Rechargeable Li-ion Batteries (here). I requested them and they did it!
with 6000mAh this is a powerhouse.
Another option was to buy them on eBay for ~$33 (here). These are $16.
This cell size is ~D alkaline. These are non-protected batteries. 4.2volts at full charge.
They also have 32600 Feilong 5000mAh cells (here)
I'm happy with this company so far. They've listened to a lot of my suggestions and made fixes to their site. Thank you FT.
that’s awesome!
I hope we see a good test of these, like 5 or 7A discharge….
Great News!
I was thinking of getting those for the high capacity, but the availability and high price tag was a turn off. I may look into getting these for 1D mag builds.
anything out of the ordinary i need to know about charging these?
someone on cpf discharged them at 10a and 13a if i remember correctly - although for the life of me i cant find the thread 
I may have to get one for the 1D mag build for the host ChiX made me. Thanks, MRTdiver, for the request and thanks to FT for carrying them!
heres a guy that did 10A and a D mag tailcap mod.
9 Amp PT-54 Phlatlight Maglite Mod! | Candle Power Flashlight Forum!
thanks - thats the thread i was looking for lol.
Yes those ‘older’ cells worked great for my PT-54 builds… 
However, I have to chime in on these new looking Feilong cells…
I sold a lot of the older style ones that were tested here…
But just recently, the manufacture ran out, and had to make more. The newer ones are not proving to be the same quality as when tested in the above link…
I’m going to have to change my thread to show that they are not the same.
Unfortunately, I don’t know if the ‘good ones’ are still available any longer??
I do know that the new 6000mAh 32650 from KD seem to be a really good cell. Because I tried one in a 3 Amp flashlight build right out of the package only at it’s 3.8 volt ‘storage voltage’, and it still gave the 3 Amps that the driver was asking for.
So that’s a good sign of a quality cell. That it still put out at 3.8 volts…
I would say that the new Feilong cells still seem to be ok for lower output. Like in a two cell/3 Amp XM-L build. But for a single cell build with high current demand, they are lacking…
well it's nice to see jayrob here on BLF.
I was going to link where you sold these Feilong cells on CPF, but I thought I better not.
Thanks for the expert insight.
Sweet! I’m impressed with FastTech so far. They listen.
Thanks for the heads-up, jayrob.
Thanks for your input jayrob. That’s what we love about BLF.
Has anybody requested King Kong 26650s yet?
They also have FeiLong 32650 5000mAh LiFePO4 Link
I hope they add some 18650 and 26650 LifePO4s as well.
yeah I did.
They got the 18650 Panasonic 3400 & 3100 mAh cells that I requested. 
Others probably asked too.
I asked for the newest Cree LEDs (XM-L2 & XP-G2)... I doubt that will happen soon though. 
For support or request something See General> Product request (Link)
What’s the real capacity?
5200 - 5400mAh depending on current draw. See the CPF thread previously linked to here.
There is no direct link….
Here is what we need, if someone else want to see capacity thread on Cpf
Feilong 32650 Test on cpf
Nice cells, but double the price of another ones…
HKJ should totally test those 32600’s, both Li-Ion and LiFePO4 
FS: 1000 Lumen XM-L U3 Mag mod with voltage monitor!
FS: Vintage Ray-O-Vac XM-L U3 Mod! (1000-Lumen)
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Shameless plug… 