"An automotive battery is a rechargeable battery that is used to start a motor vehicle. Its main purpose is to provide electric current to the electricity-powered ...
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starting motor, which in turn starts the chemically-powered internal combustion engine that actually propels the vehicle. Once the engine is running, power for the carĀ“s electrical systems is still supplied by the battery, with the alternator charging the battery as demands increase or decrease." - (en.wikipedia.org 03.09.2020)