How Long Does a Subaru Battery Last? Tips to Extend Its Lifespan!

If you own a Subaru or are thinking of getting one, you may be wondering just how long the car battery will last. While many factors affect the life of a car battery, there are some specific things you can look out for to ensure your Subaru battery stays in good condition for as long as possible. In this article, we’ll cover everything you need to know about the lifespan of Subaru batteries, signs of a dying battery, how to extend their lifespan, and how to replace a Subaru battery.

Why Does the Life of a Car Battery Matter?

The battery is one of the most important components of a car, as it powers the electrical system that lets you start the engine and use accessories like lights, radio, and power windows. A dead battery is not only inconvenient but could also leave you stranded if it happens unexpectedly. That is why it’s crucial to know how long your Subaru battery is expected to last and what you can do to extend its lifespan.

How Long Does a Subaru Battery Last?

Subaru batteries are designed to last anywhere from three to five years, depending on several factors such as driving habits, weather conditions, and maintenance. The typical lifespan of a Subaru battery ranges from 36,000 to 60,000 miles, but this may vary widely depending on where you drive and how often you use your car. If you’re driving in extreme temperatures or using your car frequently for short distances, your battery may wear out faster.

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What Are the Signs of a Dying Subaru Battery?

There are several warning signs that your Subaru battery may be reaching the end of its life. If you notice any of the following symptoms, you may need to replace the battery soon:

  • Slow engine crank: If your engine takes longer to start than usual, your battery may be losing its charge. You may hear a clicking sound when you turn the key, indicating that the battery is not providing enough power to start the engine.
  • Dim headlights and interior lights: If your lights appear to be dimmer than usual, it could be a sign that your battery is not working correctly. This could also be a sign of a charging system problem, so it’s important to have it checked by a professional mechanic.
  • Foul smell coming from the battery: If you notice a rotten-egg smell coming from the battery, it could mean the battery is leaking sulfuric acid and needs to be replaced immediately.

How to Extend the Lifespan of Your Subaru Battery

While you can’t prevent your Subaru battery from eventually wearing out, there are some things you can do to prolong its lifespan. Here are some tips to keep your car battery healthy as long as possible:

  • Drive your car regularly: If you leave your car sitting for extended periods without starting it, your battery will eventually lose its charge. Try to drive your car for at least 30 minutes every week to keep the battery charged.
  • Avoid extreme temperatures: Heat and cold can affect your car battery’s performance, so try to park your car in the shade during hot weather and use a battery blanket during cold weather.
  • Turn off all accessories when you park: Leaving the radio, lights, or air conditioning on when you turn off the engine can put a strain on your car battery and reduce its lifespan.
  • Keep your battery clean and well-maintained: Make sure the battery terminals are clean and free of corrosion, which can affect your battery’s performance. Check your battery’s water level and electrolyte regularly and top up if needed.
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How to Replace Your Subaru Battery

If your Subaru battery is dead or not working correctly, it may need to be replaced. Here are the steps to follow to replace your Subaru battery:

  1. Turn off the engine and all accessories, and make sure your car is in park or in gear.
  2. Put on safety gloves and remove any metal jewelry or watches.
  3. Open the hood of your car and locate the battery.
  4. Use a socket wrench to loosen the nut on the negative terminal of the battery (-)
  5. Carefully lift the negative cable away from the battery and secure it away from the terminal.
  6. Repeat the same process with the positive terminal (+).
  7. Remove any brackets that are holding the battery in place.
  8. Lift the battery out of the car and dispose of it safely. Many auto parts stores offer free battery recycling.
  9. Place the new battery in the same position as the old one, making sure it is snug and secure.
  10. Reconnect the positive (+) cable first, followed by the negative (-) cable.
  11. Tighten the nuts firmly, but not too tight.
  12. Start the engine and let it idle for a few minutes to make sure the battery is charging correctly.


In conclusion, Subaru batteries are designed to last between three to five years, but their lifespan may vary depending on several factors. If you notice any signs of a dying battery, it’s best to have it checked by a professional mechanic, who may recommend replacing it. Remember to take good care of your Subaru battery by following the tips we’ve listed above, and you’ll be able to enjoy its efficiency and reliability for years to come.

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Peter Banks

With years of experience as a professional mechanic and Subaru specialist, Peter is one of the most respected members of our team. He's written several articles on Subaru maintenance and repair, and his advice and tips are always practical and helpful. When he's not working on cars, he enjoys cooking and trying out new recipes.

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