Nintendo’s first major revision of the 3DS released to Japan in October of 2014 and to North America in September of 2015. The 2015 3DS introduces improved 3D capabilities, a C-Stick, new internal amiibo support,
and a new set of trigger buttons.
try to find a new battery because you just got scammed, if you look at the pictures than you can see the new one is bigger that the old one, that's because they out a new label on it so it was swollen before you bought it