I doubt that you have any recourse at all now that Best Buy's defective battery has voided the Apple warranty on your machine (if any warranty was still in effect) by leaking into it. I suspect all you can do to protect yourself now is file all the paperwork from Best Buy carefully and keep it in a safe place so you can produce it in small claims court, if it ever comes to that. Otherwise, I'm afraid you're on your own now.
Ok, just for fun....???
Best Buy (Geek Squad) sent the computer back. Cleaned the battery acid out of the battery compartment and on the inside (supposedly!). They replaced the keyboard and case around the keyboard. Got it back and worked ok except the touchpad had issues of not clicking correctly. Then the computer wouldn't charge. Thought it might be the charging block. Took it to BB and they determined it was the computer itself and not the charging block!.
I told them once battery acid leaks inside its only a matter of time before something else happens!!!...
They are not (this is the fourth time its been in for repair. Under the Geek Squad Black Tie Protection plan they will replace it with a "product of like kind and quality..blah blah blah! or reimburse you for replacement of the product with a voucher or gift card.
I can't imagine they would have some old laptop of this version hanging around,, but I digress!...
I'd like them to replace with a new unit and I'd pay some type of upgrade fee....???? I know not likely.
Wish me luck....
Best Buy received the computer back with a new battery!... Unit STILL would NOT charge!!!. Talked with Service Manager and he stated he would give us a new computer. So we got a new 13 Mac Pro with upgraded processor, hard drive, etc.
It only took 3 months to get this resolved.
Lesson: Do NOT get a Geek Squad Black Tie Protection Plan....
To be fair I don't know if Apple would have done the same!!!???... I'd like to think....NOT!
These product guarentees... they all want to sell are just a big money maker for them. God forbid they actually have to make good on their promise....
End of Story...