Ive bought my fair share of duffers, most have gone back, and a few for free as ebay seller refunded no questions asked (they knew were fake!)

bought some from here tho......

http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWNX:IT

definately genuine, and seriously cheap.... havent looked see if they have more mind you...

ill disect one of the duff ones at some point and post some pictures as comparison.

usually the fakes, the hologram is greener, not so much red and yellow, and they really struggle to show the dots on the sides of the oval logo without turning battery around. genuine ones only require a gentle pan / rotate ..... ie, the battery always faces the same way, you just alter your viewing angle, not direction. and you will see the 1,2,3 and 4 dots on the side.