Car battery in the secret back room

Hi can you help me with a battery?

Sure, what vehicle do you drive?

It’s a Ford Edge.  I already looked it up.  Do you have a C20?  There’s none out here.

Let me take a look in the secret back room.

…

Yes, I have a C20 battery.  If you are getting ready to sell the car, you might also consider the inferior D8 battery which is less expensive.

Inferior?  What is that?

Um, not quite as good.

Oh!  I thought it was a brand name.

(Wouldn't that be a challenging ad campaign?)