Edited:
Most probably FAKE
All the listings I saw read “For Panasonic” much like aftermarket parts are labeled “For OEM”. Seems suspicious.
Due to copyright issues, I think seller no longer allow to market them using their own brand names (e.g Panasonic, LG, Samsung, etc).
FAKE!
Really? You tested it before?
not panasonic.
i have a real panasonic here and positive end is completely different.and its a 3300.
no datasheet for a 5000.
its a generic cell in a panasonic looking wrapper.
FAKE is my verdict also. Battery doesn’t have the “made in Japan” on it. No battery code like “ncr18650ga” “MH12210” also missing after the Li-Ion letters.
Some 18650 also don’t have “made in Japan”!
Anyway they look nice, hope that 26650*B* will have at least 5600mAh 
by my calculations a “b” 26650 with the same tech should be 6800mah.
would mainly be a longer winding.
this thread needs moved to the batteries forum….
I’ll call BS on these too. A quick search seems to indicate that these are more chinese fakes among the many others that have been popping up online. All I could find is a datasheet for the old GCR2660A (2008). It would also be unlike pany to label these without a prefix. Lots of reputable resellers are suddenly carrying these (which means absolutely nothing since they also sell fakes). Some are listed under NCR26650A, which also does not exist in Panasonics corp lithum cell database or anywhere else that I could find. If someones google-foo can find a data sheet from a panasonic corp source, please post a link. Otherwise, Id avoid these until we know more about them from a reputable source.
So far, the ONLY chinese manufactured lithium cell that I can recommend of any size is the GENUINE Trustfire TF32650, which delivers the highest capacity of any cell its size or smaller (unprotected version provides about 6700 mAh) and maintains these levels after several discharge cycles. I have 4 that are 2 years old and still going strong after several discharge cycles.
The kingkongs are good too.as with everything fakes abound.get then from a reputable source.
Even if they are fake panas, isn’t still 5500mha at 1A pretty good for an 26650 cell?
I hope HKJ take a lot at them to see what they can really do.
so this lot is ok.
what about the next?
a little digging can probably uncover the source of the wrappers.
i can see these being yet another whateverfire.
Isn’t most 26650 cells the equivalent to “whateverfire”, as far as i know the highest capacity cells are all Chinese made cells so whats the difference as long as they test decent.
Sure if i could pick a high capacity samsung, lg, pana 26650 cell i would, for example a 26650 cell with the chemistry of the 30Q or the GA would be more than great, but they don’t exist 
About the source of the rewrappers for this cell, i am guessing the same source that soshine use for there protected 26650 5500mha cells, they test similar on the opus in capacity.
Wow. Now I finally know what to buy with with some of the $3.00 bills I have. 0:)
why roll the dice when you can get known good ones at mountain?
yes there are few japanese 26650.sony(extinct)and panasonic.
the panasonics are great high rate cells.
but low in capacity.
if these fake panasonics are good then why not put your name on them and benefit from brand recognition?
If fake batteries then assume fake test.
i dont doubt the o.p test results.
but it remains to be seen how these hold up cycle life and calendar life wise.
being above the claimed capacity is good though.
test these a few cycles and post results.