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What Are the Hazards of Disconnecting the Negative Terminal of a Car Battery?

2 Answers

MacMolly

07/29/25 7:26am

Disconnecting the negative terminal of a car battery will result in a complete loss of power, rendering the vehicle unable to start. Before disconnecting the battery, ensure the ignition is turned off to prevent damage to electrical devices and vehicle control modules. Below is an introduction to car batteries: Battery Overview: A car battery, also known as a storage battery, is a type of battery that converts chemical energy into electrical energy. Battery Classification: Batteries are categorized into conventional batteries, dry-charged batteries, and maintenance-free batteries. Typically, when people refer to a car battery, they mean a lead-acid battery. The normal lifespan of a car battery ranges from 1 to 8 years, depending largely on the vehicle's condition. Battery Principle: It uses lead plates filled with sponge lead as the negative electrode, lead plates filled with lead dioxide as the positive electrode, and a 22% to 28% dilute sulfuric acid solution as the electrolyte. During charging, electrical energy is converted into chemical energy, and during discharging, chemical energy is converted back into electrical energy.

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SanMackenzie

08/12/25 10:44am

Last time I accidentally knocked off the negative battery cable, and it caused major trouble. Not only did the car stall immediately with the infotainment screen going completely black, but all my saved radio stations and navigation points were lost. Even worse, after reconnecting it, the one-touch power windows stopped working and the dashboard showed an engine fault code – had to take it to the shop for ECU reprogramming. The mechanic said sudden power loss can corrupt the vehicle computer's data, just like force-shutting a phone loses data. What's more, when I was working on it, my tool touched the metal body and sparked, nearly burning out a fuse. Learned my lesson now: always turn off the engine and power before disconnecting the battery, and wrap the wrench with electrical tape when removing cables.

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