Electric Screwdriver uses Capacitor for Power
Coleman recently put out this screwdriver which uses a capacitor instead of a battery to supply the power. The advantages of capactiors include extremely fast recharge time and high energy output. Advancements in the last 10 years have allowed capacitors to hold charges for long times, opening the door for them to compete with rechargeable batteries. This may be the first of many new products which use capacitors instead of batteries for portable power supply.
http://www.coolest-gadgets.com/20071001/coleman-recharging-tools-in-a- flash/
