One thing I do know tho, is that the manufacturers(of your camera!!) do not manufacture batteries. So the term original manufacturer is a bit of a misnomer.
All they (probably)do is specify a particular quality from the manufacturer of the battery(who is almost certain to be the same as 50% of the after market batteries
.. and the other 50% is from the other manufacturer
) .. all
made in China from Li cells that are produced in Japan!
(That's what my aftermarket batteries say..
'(cell from in Japan) Made in China' .. no branding, nothing .... other than this, a 'For Nikon' sticker and some other hieroglyphics).