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What is the voltage of a fully charged 12-volt battery?

2 Answers

DiElla

07/25/25 3:02am

For a standard 12V car battery, the voltage when the engine is off should be around 12.8V (with a tolerance of ±0.3V). A fully charged car starting battery typically has a voltage between 12.8V and 13.0V. If the voltage drops below 11.5V, it should be charged promptly. Continued discharge of the battery can reduce its lifespan. Here is some related information about car batteries: 1. Introduction: A car battery, also known as a storage battery, is a type of battery that converts chemical energy into electrical energy. Typically, the term 'battery' refers to a lead-acid battery, which is mainly made of lead and its oxides, with a sulfuric acid solution as the electrolyte. 2. Working Principle: It uses lead plates filled with sponge-like lead as the negative electrode, lead plates filled with lead dioxide as the positive electrode, and a 22-28% dilute sulfuric acid solution as the electrolyte. During charging, electrical energy is converted into chemical energy, and during discharge, chemical energy is converted back into electrical energy.

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JulianRose

08/10/25 4:49pm

I've been driving for over a decade and always maintained my car myself. Regarding the voltage of a fully charged 12-volt battery, I recall it's typically around 12.6 to 12.8 volts. You can confirm this with a multimeter - if the reading drops below 12.4 volts, it means the battery is nearly depleted and needs charging promptly. Otherwise, battery aging and plate corrosion will accelerate, leading to hard starting or flickering lights. My car uses a conventional wet-cell battery, which needs to sit for a few minutes after charging to stabilize the voltage. Regularly checking electrolyte levels and keeping it clean can significantly extend battery life. I also remind friends to test their batteries before winter to avoid cold-start issues, which saves a lot of trouble and money.

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