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Which one did you get?

http://www.dealextreme.com/details.dx/sku.26122

http://www.dealextreme.com/details.dx/sku.11133

Both can handle 2AA but as the voltage is only 2.8volts or so with 2AA, it's hard to say how it'll behave.

If the driver is anything like the original C3, it'll just provide much longer runtime but not brighter output.

First one

http://www.dealextreme.com/details.dx/sku.26122

Yes, my C3 operates at the same brightness whether 1AA or 2AA.  However, I have a precision power supply and determined that the light does brighten up over 3.8volts, drawing about 0.5amps at 4.0volts, presumably in direct drive.  I have 14500's on order.

jeober

I will give it a try. some say  the brightness is the same others say not. I think the flashlights on DX and KD are not genuine and that is why if you test same product and compare you will find differences

I think no one will fake  Ultrafires, because the brand Ultrafire is a copycat of high quality lights. They started out with Surefire clones. If a flashlight  component is cheaper somewhere else, they will change the deliverer. That's why there are so many different versions of the same light. This is why budget light reviews are so tricky, if there are so big quality and component (especially driver) fluctuations. Of the 5 UF lights I had the possibility to check out, 3 had major/minor defects.

It's a pity the C£ stainless doesn't use the same threads as the aluminium ones or I'd try the extenders I have for the aluminium ones. Even a 3AA configuration might be possible for heaps of light for a decent time without the heat that you get from 14500's. Anything the can run on 14500 should cope with 3AAs- just. Here's a pic of the single mode Aurora SH0030 doing just that. Those are two C cells beside it. The result is 200mm (8") long.

Actually , there are fake Ultrafires ...  

I contacted Ultrafire about one light and they said it was counterfeit .  

I am really lucky that my father has a machine shop in the basement. When the light arrives i will mod it and post resaults.

Actually , there are fake Ultrafires ... 

that really sucks!!

i think i will make my own flashlights from here on....

Well , some of the Counterfeits are actually better built than real Ultrafires . 

So I would not worry about it too much .