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battery 
Unit storing the electricity produced by the alternator and releasing it to supply the vehicle’s electric system.
battery case
Box made of insulating acid-resistant material; the chemical reactions between plates are produced in it.
hydrometer
Color indicator giving information about the state of the battery.
negative terminal
Polarity element connected to the negative plates and attached to an electric cable, which connects the battery to the electric circuit.
battery cover
Upper part of the battery, sealed in the case.
positive terminal
Polarity element connected to the positive plates and attached to an electric cable, which connects the battery to the electric circuit.
