Santa's Energy Consumption

I'm finding that Po is primed for fun facts and figures during our drive to B's school in the morning. The fun fact is always preceded by several minutes of silence, so I know his wheels are turning. This morning he was contemplating Santa's power supply:

"I bet Santa has to use a REALLY big battery to power his toy machine."

I said, "I don't even know if they make batteries that big. I bet he uses electricity."

"Nope. It's a big battery."

And so the dilemma has been solved. I wonder if Santa has to replace his battery as often as we have to replace the ones in the toys he brings. Wouldn't that be sweet justice?