What Would YOU Do?

[Lost_in_the_HTTP]

^^^ It was charged.

 

[Spacehead]

OP, i would have done as you did. Point out they forgot something & pay for it.

 

[Lanyap]

Here's the real question... if the cashier forgot to scan the battery, and you weren't thinking and put it in your car and drove all the way home before realizing, would you go back to the store to pay for it?

Depends on how far away the store was. If close I would go back and pay. If far away I would call them up and explain and give them my CC to charge it.