Why is my Mercedes battery draining?

The battery is too old.

With newer vehicles, especially luxury vehicles like a Mercedes-Benz, there are a lot of electrical components for infotainment and other features that can drain the battery. If you’ve had the battery for too long, it will lose power easily.

How much does a Mercedes battery cost?

On average, you can expect to pay about $400 to replace a Mercedes Benz battery. The typical price range is between $300 and $500. Generally speaking, it is more expensive to replace the battery on a new Mercedes than on an older model.

Why is my Mercedes battery draining? – Related Questions

Does a Mercedes require a special battery?

Any battery that goes into your Mercedes-Benz must match the group size of the old battery. The majority of models from the automaker are equipped with an AGM H8 battery. As you shop around for a replacement battery, it should probably be a Group 49 AGM battery.

How do I know if my Mercedes battery is low?

Signs Your Mercedes-Benz Car Battery Is Failing
  1. Headlights brighten when revving the engine.
  2. Headlights dim when engine is idling.
  3. Corrosion is visible on car battery cables and terminals.
  4. Frequent jump-starts needed.
  5. Takes longer for your Mercedes-Benz to start.
  6. Learn more signs your Mercedes-Benz car battery is dying.

How long does a Mercedes C300 battery last?

Your Mercedes-Benz C300 battery will typically last between 3 to 5 years, but that can vary heavily depending on type of battery, battery size, weather conditions and driving habits.

How much does it cost to replace a Mercedes C300 battery?

Mercedes-Benz C300 Battery Replacement Cost Estimate. The average cost for a Mercedes-Benz C300 battery replacement is between $2,398 and $2,424. Labor costs are estimated between $100 and $126 while parts are priced at $2,299.

Can AutoZone replace a Mercedes battery?

Yes, AutoZone installs batteries. Not only does AutoZone sell batteries, but they can install them, too, in most cases. If your car’s battery is dead, won’t hold a charge, or if your car won’t start, it may be time for a new battery. AutoZone carries a large selection of batteries and installs them.

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What Mercedes has 2 batteries?

The Mercedes S550 is one model that has two batteries; one to start the engine, and another – called the auxiliary battery – to run the car.

How do I know if my Mercedes auxiliary battery is bad?


Many Mercedes have the main battery and a backup battery known as the auxiliary battery. If it is the auxiliary battery that malfunctions, you’ll get an error message on your car’s dashboard. This will be a generic warning with a small battery symbol.

Why does Mercedes have an auxiliary battery?

Auxiliary batteries work with your main starter battery, and as a backup battery in the event the main battery becomes disabled. It prevents your vehicle’s electrical components from dropping when starting/stopping your engine and keeps your radio, GPS, and other in-vehicle electrical components turned on.

How do you trickle charge a Mercedes battery?

How do you start a Mercedes with a dead battery?

Can a trickle charger ruin a battery?

Leaving an unattended trickle charger on for too long might lead to overheating, causing the battery to boil the electrolyte. The outcome would be a dead battery or a worse case scenario— a possible fire/explosion.

Can you use a trickle charger on a Mercedes-Benz?

A trickle charger keeps your Mercedes-Benz battery charged, which in turn, results in your battery lasting longer.

How do you jumpstart a Mercedes?

How do I jump start another car with my Mercedes?

Locate both the positive and negative terminals, and check to see if they’re free of corrosion. Place the red clamp to the on the positive post on the dead battery. Then, hook the other red clamp to the positive terminal of the battery with the charge. Place the black clamp to the negative post on the good battery.

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What kind of charger do I need for AGM batteries?

Most AGM battery chargers are compatible with either six-, 12-volt, or both batteries. If you’re looking to charge larger vehicles, you’ll need a 12-volt charger. For smaller vehicles, like ATVs, lawn tractors, golf carts, etc., you can use a six-volt charger.

How do I bring my AGM battery back to life?

Purchasing an AGM-specific charger is the easiest way to revive a deeply discharged AGM battery. AGM batteries have to be charged long and slow with a low current setting. Using a standard charger can negatively affect the performance of the battery, which could end up costing you more then a AGM-specific charger.

About the author

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William Getty lives and breathes cars. He started driving cars as a 12 year old on the racetrack with his dad. Since then cars has always been a big part of Williams life.

In his garage you can find his beloved 2005 Ford Mustang, as well as a 2020 Audi A3.

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