Currently electric vehicles are increasingly being developed, even already being sold in the world market, including in Indonesia, because the price of the vehicle is very expensive and is still very calculated about the fuel of the vehicle itself, the battery, so few people use this electric vehicle. Battery is one component of an electric car that is very important, the battery is used as a source of current for the entire electrical system and as a place to store electrical energy in the event of a charging process. The battery serves to supply electrical current when the starter system so that the engine can be turned on, the lights and other electrical components. Because there are many uses of electrical energy needed by electric cars, further research is carried out regarding the calculation of battery capacity that will be used to manufacture electric cars and how to process chargers. The length of battery charging lead acid 70 Ah 12 V depends on the amount of current that is an energy source to charge the battery, to charge the battery with fast charging method requires a charging current of 40% of battery capacity, and for slow charging method requires a charging current of 10% of capacity battery.
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