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does a battery get filled up with electricity at the battery factory, or do it's composite parts generate (and store) electricity?
Depends what kind of battery. In general, things which are rechargeable are assembled in the discharged condition and then charged before being put into service, while things which are not rechargeable are assembled from components which already want to pump electrons from one electrode to the other.
does a battery get filled up with electricity at the battery factory, or do it's composite parts generate (and store) electricity?