Summer Heat and Its Impact on Car Batteries

As temperatures rise during the summer months, it’s not just your comfort that’s at risk—your car battery can also suffer from the sweltering heat. At Accelerate Auto Repair and Collision in Rowlett, we’ve seen firsthand how summer heat can take a toll on car batteries, often leading to unexpected breakdowns and costly replacements. Understanding how high temperatures affect your car battery and knowing what preventive measures to take can keep your vehicle running smoothly throughout the season.

How High Temperatures Affect Car Batteries

  1. Increased Fluid Evaporation—Car batteries rely on a mixture of water and sulfuric acid to generate power. High temperatures can cause this fluid to evaporate more quickly, leading to a decrease in battery efficiency and lifespan.
  2. Chemical Reaction Acceleration—Heat speeds up the chemical reactions inside the battery, which can result in overcharging. Overcharging not only reduces the battery’s life but also increases the risk of internal damage.
  3. Heat-Induced Corrosion—The battery’s internal components are susceptible to corrosion, which is exacerbated by high temperatures. This corrosion can impede the battery’s ability to hold a charge and deliver power effectively.

Tips for Extending Battery Life During Hot Months

  1. Regular Battery Inspections—Routine inspections are crucial for catching early signs of battery wear and tear. At Accelerate Auto Repair and Collision, we recommend having your battery checked at the start of summer. Our technicians will ensure the fluid levels are adequate and that there are no signs of corrosion or damage.
  2. Keep the Battery Cool—Whenever possible, park your car in shaded areas or use a car cover to reduce the amount of heat your battery is exposed to. Excessive heat from direct sunlight can accelerate fluid evaporation and exacerbate the issues caused by high temperatures.
  3. Check the Battery Cables and Connections—Loose or corroded connections can prevent your battery from functioning properly. Regularly inspect the battery cables and terminals for any signs of corrosion or looseness. Cleaning the terminals with a mixture of baking soda and water can help maintain a good connection.
  4. Limit Short Trips—Short trips don’t give your car’s alternator enough time to fully recharge the battery after starting the engine. Try to combine errands into a single trip to allow the alternator more time to charge the battery, especially during the hot summer months.
  5. Monitor Your Battery’s Health—Invest in a battery tester or bring your vehicle to Accelerate Auto Repair and Collision for regular battery health checks. This will help you stay ahead of potential issues and replace the battery before it fails.
  6. Stay on Top of Maintenance—Regular vehicle maintenance, including oil changes and engine checks, can prevent issues that may indirectly affect your battery. For instance, an overworked engine can place extra strain on the battery.
  7. Use Battery Insulation Kits—Battery insulation kits are designed to protect the battery from extreme temperatures. These kits can help maintain an optimal temperature range for your battery, preventing overheating during the summer months.
  8. Replace Old Batteries—Batteries typically last 3-5 years. If your battery is nearing the end of its lifespan, consider replacing it before the summer heat puts it to the test. Older batteries are more prone to failure under high temperatures.


Don’t let the summer heat catch you off guard. By understanding how high temperatures impact your car battery and following these preventive measures, you can extend the life of your battery and avoid inconvenient breakdowns. If you’re unsure about the health of your battery, bring your car to Accelerate Auto Repair and Collision in Rowlett. Our expert technicians will ensure your battery is ready to handle the summer heat, keeping you on the road safely and efficiently.

Stay cool, and drive safe!