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Caps can be used as batteries, but the use is limited to relatively small power using purposes. Although there has been tremendous improvement in the electrical storage capacity of capacitors, there is still a limiting factor of power "density." or how much power they can hold, related to their size. That said, capicitors are already being used as "batteries" in/on the flashlights that one either turns a crank or "shakes" to charge. They are used in "identification" transponders that are embeded under a pets skin, or for many other uses. As the transponder moves past an interrogation device, or a "wand" is moved over the transponder, an electrical field created momentarily charges a capicitor(s) in the transponder, which then in one small burst transmits to the interrogation devicethe code or info stored in the transponder.

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Q: Why cant capacitors be used as batteries?
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