Where can I buy new battery for my MacBook Pro A1250?

That Mac was discontinued over eight years ago so Apple will no longer officially provide support for it, though an independent service center might replace the battery for you. Otherwise you'll need to just shop around. The "fixit" sites, to which we are not allowed to provide links, can provide instructions and in some cases parts.

Given how old that Mac is, I'm not sure I'd spend any money on it if it were mine. Up to you, though.

Regards.

OWC is another option:

https://eshop.macsales.com/

I cannot get the exact model from the Axxxx designation, so I don't know the exact model laptop you have. You can get the exact model by clicking the Apple menu and selecting "About This Mac".

FYI, if it is a Retina model laptop, then the batteries are glued in and can be very difficult to replace. In fact OWC recommends having the battery replaced by a professional.

HWTech wrote:

I cannot get the exact model from the Axxxx designation, so I don't know the exact model laptop you have. You can get the exact model by clicking the Apple menu and selecting "About This Mac".

Going by the model number in the subject line, it's a MacBook Pro "Core Duo" 2.16 15" introduced in 2006. Whether that's the correct model number I don't know. Perhaps the OP will post back and confirm or give us the correct information.

Regards.

I can't get the MacTracker database or EveryMac.com to return anything Apple with an "A1250" number. There is an Early 2008 15" Macbook Pro that is A1260.

We definitely need clarification!