OP now you have a whole list of cells to choose from, with the 840mah UR14500P cell. Its always good to know which brands contain the best cells. One of them is always cheaper even though its the same cell inside. :bigsmile:
Out of the 14500's I have (KeepPower and Trustfire), the Nightcore's are by far the best.
I like to use IMR 14500 batteries for flashlights that pull more than 2A. I find that although IMR batteries have lower capacity, it remains in regulation longer than the regular lithium ions.
Yeah it does, I wasn’t contradicting you, just pointing out that in this case even the wrap and PCB are the same.
Btw Nightcrawl, I have to admit that I’ve only just checked out your link. You’re right, it does look like the Nitecore cells are about matching the UR14500p based ones. Very interesting.
These are 1200mAh …but don’t believe it! 
You cannot always go by the advertised rating, look at some reviews, tests and graphs like this one:
Test/review summary for small batteries
For me it’s a bit intimidating to try and understand all of the technical data in the tests/reviews/graphs but from what I can tell these Keepower did good in the testing linked above, and are a good value at around $5 each (if you can use 4 of them). I’m thinking about getting these.
Keeppower 14500 are now available from doingoutdoors (but not, alas, to the UK, Germany etc etc).
Interesting that the label on the Nitecore 14500 packaging claims “Made in China”, but that might just be the printers. 
Thanks for pointing out those keeppowers at doingoutdoors, they would be my pick as the best option. I’ve sent bill an email asking for clarification on shipping (or not) to the UK/Germany. I didn’t think we had any bans on li-ion?
Let me know what his reply is - I’m interested too. I didnt think we had a ban on these either - I just got some 18650 from Hong Kong (FastTech) a couple of weeks ago…
edit I just emailed Bill as well.
The Post Office over here has had restrictions on Lithium cells for a while now. 7Dayshop stopped shipping them for a while, and now will only deliver by courier. Obviously courier delivery is much safer than regular mail. :~
Didn’t stop Fasttech shipping me some Nitecore’s recently. Bill has also had the restriction in place for quite some time - since before his own web site opened up.
Looks like I’ll have to order from FastTech again. The Post Office really are a bunch of chimps.
Zebralight sells 840 mah 14500s.
I don’t know what cell they use inside, but they’re a good company and I think their claims are probably reliable. These cells work great in the Zebralight SC52.
If it’s 840mAh it’s almost certainly the Sanyo cell inside.
You’re welcome, I’m glad my post/link was helpful.
So the Nitecore’s beat the KeepPowers in terms of runtime?
I doubt it, though there are no performance graphs that show both.
Actually, Nightcrawl’s one does. Keeppower comes out slightly on top.
The Sanyo UR14500P could go down to 2.5V according to the datasheets.
No, my problem with the keepPower's are their inconstant diameter size. 2 out of the 4 I bought don't fit my Xeno E03. They suffer from poor quality control IMO, at least mine do
Thanks for the explanation, valuable info since I have an Eo3 as well. Unfortunate though since I was set on the Keeppowers for the great price on 4. But 2 out of 4 may not be too bad if they will fit other lights, still taking a chance on all 4 coming in too thick.
EDIT: Just checked and the Keeppower specs show a diameter of 14.2mm, the tube ID on my E03 is 13.98mm, so going by the specs the Keeppowers wouldn’t fit. My AW protected (13.38mm at widest point) is quite loose, it has a lot of play around it. I was going to get the Nitecores now instead (only $1 more) but now I’m perplexed because the Nitecores at Fasttech show a Dia. of 14mm, so by the specs those won’t fit either.
atbglenn, would you be able to post the measurements of your E03 tube ID and Dia. of your nitecore batteries? My Xeno is the V2 not the V3.