How many batteries does the Mercedes-Benz C180 have?
2 Answers
The Mercedes-Benz C180 has two batteries, one is the main battery and the other is the auxiliary battery. The main battery is located on the right side of the engine compartment cover, and you can see it just by opening the hood. The auxiliary battery is on the right side of the trunk. The original battery used in the Mercedes-Benz C-Class is a VARTA 12V 80AH CCA 800A AGM battery. If you notice abnormal ignition or battery fault warnings in your Mercedes-Benz C-Class, you should promptly take it to a 4S shop or a specialized auto repair shop for inspection. Do not attempt to replace the battery on your own to avoid serious consequences. Functions of the Mercedes-Benz C180 auxiliary battery: Supplies power to the lighting system, windows, entertainment system, etc., during startup; provides power to various electrical devices when the engine is not running or running at low speed; assists the generator in supplying power to various electrical devices when the power consumption exceeds the generator's capacity; stabilizes voltage; acts like a large capacitor, absorbing instantaneous overvoltage in the circuit to protect electrical devices. Functions of the Mercedes-Benz C180 main battery: Acts as a voltage stabilizer for the entire vehicle's electrical system, mitigating impact voltage in the electrical system to protect the vehicle's electronic equipment.
Having driven a Mercedes for over a decade, I find the battery configuration of the C180 quite thoughtful. It typically comes with two batteries: the main battery located in the engine compartment, dedicated to starting the engine—if this one fails, the car won't even start; there's also an auxiliary battery under the trunk, powering the infotainment system, audio, and other onboard electronics. When I last replaced the auxiliary battery, I noticed that older models often missed this feature, with some pre-2015 versions possibly equipped with only the main battery. The key point is that these two batteries don't age at the same rate—my car's main battery gave out after three years, while the auxiliary one was still functional. Regular maintenance requires checking the voltage with a multimeter, especially monitoring the dashboard voltage display before starting in winter. If you're upgrading the audio system, pay extra attention to the auxiliary battery's load capacity. When replacing, it's advisable to choose a compatible AGM battery—though more expensive than standard lead-acid ones, they're more durable.
