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| What is battery? (2008-8-1) |
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Battery is a device to use electric energy which was once stored as a chemical energy and transformed back to the electric energy when necessary. That is to say, it is a device in which two different or same metal electrodes are put into the elctrolyte. 'Discharge' is that an electric current flows out from a battery. On the contrary, 'charge' is that the electric current is taken into the battery. ' Charge' is to let electric energy in from the outside and have it cause chemical changes in opposition in order to pull the electric energy out to use again when necessary.
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