Today it's rainy.....(batteries)

Today it's rainy,as my feeling.I am blue.My friends ask me why,i say i don't know.But in fact i know,i am well aware fo why.But maybe it is still a devastating thing to recount.So i opt to forget it.Now i shoule tell my friends some battery tips.I think they need.These maybe are helpful for them.I think i should do something to shift my attention.
What is a Battery?In science and technology, a battery is a device that stores energy and makes it available in an electrical form. It converts chemical energy into electrical energy, producing an electric current when connected in a circuit. The finished battery is an electrically connected group of cells (wired in series) that stores an electrical charge and supplies a direct current (DC). We usually call finished battery as battery pack and unfinished battery is called as cell.
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