Truthfully, I hoped for a nuclear battery but thinking about the average joe led me to think otherwise. People aren't too careful and the last thing we need is a bunch of mini nukes to go off. 
But yeah we definitely need to push some of the newer battery concepts being demoed, lithium-ion tech has reached the maximum amount of electricity that can be shoved in a cell.
But yeah we definitely need to push some of the newer battery concepts being demoed, lithium-ion tech has reached the maximum amount of electricity that can be shoved in a cell.