Wanted: old tool batteries - $20 (East bay or south bay)

I will pay you cash for old 18V/20V batteries from Makita, Dewalt and Milwaukee.
I'm only looking for Lithium Ion batteries.
These are the batteries with the flat top like in the pictures, not the older batteries with the post.
I don't care how big it is (i.
e.
2AH, 5AH, 8AH, etc.
), as long as the connection on the top looks like the pictures.
If they work and will charge, I will pay you $10/battery.
I really don't care how much life the battery has in it as long as it charges and completes a charge cycle on the charger.
If they wont charge but the case is still in good shape, I still want it and will pay you $5/battery.
I'm happy to come pick them up from you at a convenient meeting location or at your home if you are in the east or south bay area.