NOVA recently aired an episode near and dear to all of our hearts "Search for the Super Battery"
The official site is here:
NOVA - Official Website | Search for the Super BatteryYou can find it streaming on youtube and other outlets as well.
One of the more interesting technologies is the solid electrolyte lithium battery some here may have seen reported. The film shows an iPad connected to one of these batteries that continues to run as it is stabbed with a screwdriver and cut in half! The battery doesn't explode, or even get hot!