First 3 comments are lists of different types of batteries along with discharge curves. <--Still in progress
Can anyone point me towards the NCR18650B datasheet?
Double Ditto!
They haven’t been seen in public yet 
But you might try asking HKJ, he often has datasheets for cells that other people haven’t even heard of 
Edit: and, by the way, those FAQ threads about LEDs, Li-Ions, etc are a very nice Christmas present from you to BLF community! Thanks 
Ok, thanks. That's what I was guessing. I'll send him a PM.
Good job, Scaru!
The only correction I'd offer is that all ***fire cells are NOT crap. Most are, granted, especially the Ultrafire offerings, but a genuine Trustfire cell is a damned good budget cell with excellent capacity and are as safe any other good Li-Ion cell.
I have heard people say that many times, but I have never come across any trustfire cell (or any xxxxfire cell) that is equal to any other trustfire cell. For this reason they can't be used in series. At one point I had 2 that were within 60 mah of each other, but they had drastically different internal resistances. (So in high drain lights they would not be equal)
So for that reason I would say they are crap, at least for multi-celled lights. I don't see the point in ordering them, when you can buy good brand name 2600 mah cells for only a bit more.
I simply don't believe in blanket statements. I only suggest that you qualify the original "crap" statement that in a multicell light they may want to avoid certain cells but some are fine in single cell lights. Otherwise it comes across like you are one of those Surefire fanboys that is convinced that any chinese light or budget light that is not a Surefire light (that is to say any light other than a Surefire) is guaranteed to fail the next time you need it or explode in your hand and kill you and your entire family.
Many of us use Trustfire cells extensively and have never had an issue with a genuine Trustfire cell. Just sayin'...
Ok, I replaced it with this.
"First of all, any battery that has "fire" in it's name is not suitable for use in multi-cell lights. This is because even if they may be rated at the same capacity, they are most likely not equal and could become unbalanced under high loads."
As for using them extensively, I would personally not trust them that much. If they were in my DRY rather than name brand batteries I am not so confident it would have ended so well.
Much better. I agree about the time your DRY was turn on in your luggage. You were darned lucky regardless of what cells were in it. While I did say “extensively” I did not say “exclusively”. I prefer my Panasonic cells to the Trustfire cells also and feel safer with them in my multicell lights too, even in unprotected form. I monitor my cells voltage in multicell lights and only run in sets that discharge at the same rate and check in at the same voltage. I also have several TF Flames that are matched quite nicely and that I trust. As for any other ***fire brands, I try and avoid them like they were covered in syphilis!!
True, I guess your right. For single cell they are fine, they may not give the best run time or performance but they will work.
Ok, the 18650 section is done. The smaller battery section is still a work in progress.
How important is it to prevent overdischarge of a single cell?
There is a discussion on the BLF “Protected Circuits” forum.
Important, but as long as you recharge the cell right after you over discharge it, it will be fine. If you don't it won't be good for the cell, but it certainly won't explode or anything of that sort.
The AW 2000mAh tests worse than the CGR18650CH at 10A, so I wouldnt recommend it for 10-20A. Anything above 10A should currently use the AW 1600mAh (its rated for a max. of 18 or 24A IIRC..).
Also, for smaller cells, you could also recommend Efest cells. They got some good ones.
Ok, I'm going to actually get rid of that "guide" thing and leave just the comments.
Any smaller (than 18650) batteries I should include other than 14500, 18350, and 16340?
And you got the APR18650M1 twice. :)
I'm aware, I put it in there twice because I wanted it under IMR (since it does such high currents) and under LiFePo4. I understand this is not technically correct since it is not LiMn cell, so maybe I should remove it from the IMR section?
Technically speaking, the CGR18650CH isnt LiMn either..^^
But I would keep LiFePo4 cells out of the LiIon lineup, those are too special and only very few people actually use them.
Btw.: what about 32650, 26650, 26500, 22650, 18500, 17650, 16650, 14650, 10440, 10180? (yes, I'm here to molest you)
Oh, and where did you get the graph of the Sanyo UR18650W? I ordered W2 and WX recently, waiting for them to be tested..
Yup, it doesn’t belongs in IMR section.