How Many Amps is 12V?

[LucyAnn]

The working current of a 12V battery depends on its model, i.e., capacity. It is usually marked on the casing. The larger the working current, the shorter the duration. For example, a 20Ah battery discharging at 2 amps can last for 10 hours before needing a recharge. The instantaneous maximum current can reach 70 to 100 amps or even higher. However, it's important to note that excessively high currents can cause problems, including battery explosion. When a battery is severely depleted, it should not be charged using the car's alternator; instead, a portable charger should be used. A 12V battery cannot be equated to a specific milliampere value. Batteries are typically described by two data points: voltage and capacity, e.g., 12V65AH. This is read as '12 volts 65 ampere-hours,' meaning the battery has a voltage of 12V and a capacity of 65 ampere-hours. Milliampere readings represent instantaneous current and do not indicate the battery's capacity. Signs that a battery is fully charged: A large number of bubbles are generated inside the battery, creating a boiling effect. The terminal voltage rises to its maximum and does not increase further within two hours. The electrolyte level rises to its highest point and does not increase further within two hours.