At the moment almost all electric cars use battery technology, which has its share of drawbacks ranging from heavy weight to charge degradation after multiple recharge cycles. But a secretive Canadian company called EEStor is working on using high-energy capacitors to replace cumbersome batteries and do away with many of their problems. A capacitor allows you to charge your car in minutes by plugging it in to mains power, has no power loss after time, and none of the exploding battery fears that have surrounded everything from mobile phones to laptops.
EEStor is claiming its technology could have almost 10 times the energy battery with the same weight and could cost half as much if mass produced. You can read more about this over at TreeHugger. It certainly sounds interesting, even though there are no plans for production in the near future.