Battery has the power you sustain with. However, battery also lose power someday. Hence, there is a kind of battery can be recharged many times, which is called rechargeable battery. This battery is charged through D.C.
Funnily, if we compare battery to a person, who need power to live. Where is person's battery from? How to charge this battery? Whether can a person sustain without battery?
As long as this battery is charged constantly, life can have chance to continue.
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