The usual giveaway is misspellings on the packaging or battery like the "genuine" Panasonic CR123s I got on eBay which say "Matsushita Elestric Industrial Co."
If you have eyes the age of mine, use a magnifier to check for typos in the small print. I'll put up some pics of my known genuine Eneloops for comparison though minor changes may have happened in the two or so years since I bought them.
The light box and the tripod are somewhere in the trunk of the car just now so here are some not great pics to be going on with. the flash has not made them easier to see.
There are 4 vents at 90 degrees apart at the base of the +ve button, though i think I read on CPF that there were some with three vents instead but I can never find stuff on CPF these days. A quick look through the "Flashlight Electronics Batteries Included" section should give some answers with any luck.
Hmmm, thanks for the pics Don! Mine are "Size AA HR6", I'm not sure why that is different from yours. And the precautions bullet points are in a paragraph instead of aligned in a list, as this terrible picture kind of shows:
The R6 is AFAIK the ISO designation for that size of cell (Actually the IEC is the standards body - the International Electrotechnical Commission AFAIR) - it may be that the ANSI standard is different. Turns out I'm not entirely right on this - at least according to the source of all that is apocryphal. The ANSI name as far as I can figure out from a poorly written article is 15H. The HR may be for the part of the world that goes by ANSI instead of IEC.
R6 is the size of the cell - the H prefix means NiMH rechargeable. So both R6 and HR6 are correct though HR6 is more correct. I suspect a typo in the Wiki as it says the H should be a suffix which would make the proper name R6H. Actually as it is in Wikipedia I'd need signed statements from three known expert witnesses before I'd necessarily believe that water is wet.
Heres mine....Sanyo must have changed the label at some point or another.......Yes my cells have been through hell and back, what did you expect from 5 years of use. And this is what happens when you force the cells into a tight fitting tube made for alkalines.