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Battery terminology? Answered

Just to clear up possible confusion: you stated
“DC electricity is the type of current that comes from batteries, which are basically special containers that store a predetermined amount of voltage.”

A battery stores a predetermined amount of power, not voltage. It releases that power as electrical current at a particular voltage over a certain amount of time.

For example, a triple-A battery has the same voltage rating as a double-A battery, but the AA stores more power.