Need new battery for My blade 12.5

Hi! I from México.
My battery for My Blade 12.5 need a change of battery but un The community i read that i need a ticket.
The computer was a gift from my cousin to continue The university, but that was already 4 years ago that I started it. My cousin is American but she does not have the purchase receipt. How could I get a battery and if possible a replacement charger? I know I no longer have free support.