How the cold affects the car battery
Lead-Acid Batteries
- Capacity Reduction: At sub-zero temperatures, the electrolyte in the battery thickens and internal chemical reactions slow down, decreasing the battery's capacity and therefore its starting ability.
- Electrolyte Freezing: In extremely cold conditions, especially if the battery is discharged, the electrolyte can freeze, damaging the lead plates and compromising performance or rendering the battery completely useless.
- Reduced durability: Lead-acid batteries are more susceptible to wear under extreme temperatures due to the effect of cold on the electrolyte liquid.

AGM batteries
- Better cold-weather performance: AGM batteries use an absorbent glass fiber separator structure instead of a liquid electrolyte, allowing the acid to be completely contained. This gives them better resistance to capacity loss in cold climates.
- Improved cold cranking capacity: AGM batteries can handle cold weather starts better because they are more efficient at delivering power in low temperatures.
- Lower risk of freezing: Because the electrolyte is not completely liquid, the risk of freezing is much lower, helping AGMs perform better and more reliably in extreme cold.
- Durability and Long Lifespan: AGM batteries typically last longer in extreme cold conditions than traditional lead-acid batteries, thanks to their construction and resistance to sulfation (a common problem with lead-acid batteries in winter).
It's important to note that we can't replace a car battery with a different technology without verifying compatibility. The possibility of making the change depends on the type of vehicle and its specifications. If you want to know when it's feasible to replace your battery with another technology, READ HERE.
The usefulness of a thermal cover for the battery
To protect your battery from low temperatures and improve its performance, using a thermal cover is highly recommended in extreme cold climates. These covers are designed to insulate the battery from the cold, maintaining a more stable internal temperature and preventing the cold from overcooling it. Some thermal covers even come with electric heaters that can be connected to warm the battery before starting the engine. This not only helps the battery maintain its charging capacity in low temperatures, but also reduces wear on the starter motor and improves battery life.
Conclusion
Having a good starter battery, especially in cold climates, is essential to avoid starting problems and preserve battery life. FQS Batteries give you that peace of mind and security. Maximum quality. Optimal performance in extreme conditions.
Using a thermal sleeve is an investment that protects your battery, improves its performance, and prevents stress caused by extreme cold. It can be an excellent option.