An ultra-capacitor stores energy by polar electrolytic solution. This mechanism is reversible, allowing the ultracapitor to be charged hundreds of times. There are many different applications that can use ultracapacitors including:

• power tools and toys
• backup supply
• power buses
• computer memory backup

Lithium ion cells use lithium oxide to form a cathode and a carbon based material to form a anode. This type of battery is a rechargable dry-cell. Some applications that include the use of lithium ion cells include:

• Electric bicycles and scooters
• Golf Carts
• Electric Vehicles
• Wheelchairs
• Lawn mowers