If it was strong enough to pull a car uphill, it would be covered in leaves, trees, garbage, dead animals, etc. You wouldn't see the hill at all if
it was that strong. Think about how heavy a car is and how much energy is needed to pull it. Then think of Everest, which only contains enough mass to
pull a ball on string slightly sideways (they tried it).
Really, there isn't enough mass to create enough gravity to pull a car there. It's an illusion. As for the battery, I have no idea. It is feesible
that there's something there creating some sort of interference, but wouldn't there be some signposts saying "Do not drive here" because this
would stop cars from working too.
It really is an illusion, my friends.
However, PA is full of Iron. It could be a different hill and I could be talking poo-poo.