While that is true I believe that 4200mAh one is legit.
What was not legit? The two "3500mAh" batteries that I got on Amazon. They are only 3100 yet seem to be only last 75% of the OEM. But they were only $10 for the two of them so oh well.
Then I got a 3100mAh battery from a more reliable and to my surprise it seems a little better than OEM--even though the same mAh. Go figure.
Michael
Cool dude. I always use precautions when buying batteries. That's pretty sweet you found a battery that will last a little longer than OEM! Especially at the same mAh.