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How to Measure the Condition of a Battery?

1 Answers

McHeidi

07/29/25 4:43pm

Use a multimeter to test the voltage of the battery under no-load conditions. The voltage should be 12V and very stable. If the voltage is too low or fluctuates, it can be judged that the battery is aging. Connect the multimeter to the positive and negative terminals of the battery, then start the car and turn on the air conditioning to observe the voltage reading. If the voltage drops significantly, it can be determined that the battery is aging. Below is an introduction to automotive batteries: 1. Structure of automotive batteries: Automotive batteries are an essential part of a car and can be divided into traditional lead-acid batteries and maintenance-free batteries. The structure of a lead-acid battery mainly consists of positive (negative) plates, separators, electrolyte, casing, connecting bars, and terminals. 2. Function of automotive batteries: When starting the engine, they provide a strong starting current to the starter. When the generator is overloaded, they can assist the generator in supplying power to electrical devices. When the engine is idling, they supply power to electrical devices.

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