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What a Car Battery Does: The Core Functions Explained
Learn the five core jobs of a car battery, from starting the engine to smoothing voltage, how it works with the alternator, and signs it may be wearing out.
Batteries
Battery Basics
5 guides, starting with What a Car Battery Does: The Core Functions Explained.
Car Battery Ratings and Sizes: CCA, Ah and Group Size
Decode car battery ratings such as CCA, CA, reserve capacity and Ah, and learn how group size, terminals and date codes help you choose a battery that fits.
Car Battery Types Compared: Flooded, AGM, Gel and Lead-Acid
Compare flooded, EFB, AGM, gel and lithium car batteries, see how gel differs from standard lead-acid, and learn how to pick the right type for your vehicle.
How Much Does a Car Battery Weigh?
Most standard 12V car batteries weigh roughly 30 to 60 pounds (14 to 27 kg). See what affects weight, how EV packs differ, and how to lift one safely.
What Voltage Should a Car Battery Be? Readings and Meaning
A healthy 12V car battery rests around 12.6 volts and reads about 13.7 to 14.7 while running. See what other readings mean and whether a car battery is AC or DC.
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More in batteries
Battery Health 6 guides, starting with How Long Does a Car Battery Last, and When to Replace It. Battery Troubleshooting 4 guides, starting with Car Battery Troubleshooting: Revive, Test and Find the Drain. Battery Charging 3 guides, starting with How to Use a Car Battery Charger Step by Step. Battery Replacement 3 guides, starting with How to Install a Car Battery: Step-by-Step Replacement Guide.