As the temperatures go down, so does the performance of many battery systems, particularly in the severe winter climate. For users of AGM (Absorbent Glass Mat) batteries in cars, backup systems, or renewable energy configurations, cold weather poses different issues. Although AGM batteries are more resistant than most other batteries, they are not resistant to freezing temperatures. The knowledge of how to treat and maintain your batteries in the winter period can be the difference between life and death when they are needed the most.
How Cold Weather Causes Battery Performance.
Temperature has a direct effect on the capacity of batteries. The colder it is, the slower the chemical reactions in a battery take place, and the power output and charge acceptance drop. Even a good AGM battery may lose up to 30–40% of its capacity when the temperature drops to freezing level and below. When it is extremely cold, the risk of voltage drops, less cranking power, and longer charging time goes up.
Storage and Installation Best Practices
Storage is one of the simplest ways of ensuring that your AGM batteries are not damaged by the cold. If it is possible, install batteries in the controlled temperature area such as an insulated battery box or indoor compartment. If it is required to install the batteries outdoors – as in solar energy systems or marine applications – make sure that they are enclosed in a protective housing to protect them from snow, wind, and direct exposure to freezing air.
Also, install thermal blankets or battery warmers, particularly in areas where the temperatures tend to go below 0°F. These accessories can help to prevent internal temperatures from getting too low and to keep the output of voltage constant.
Keep Batteries Charged
Of all the rules of winter battery care, the most essential one is to maintain your batteries fully charged. AGM batteries which are left at a low state of charge are more prone to freezing and permanent damage. Use smart chargers that automatically keep the charge levels optimal, particularly for vehicles or equipment that are rarely used in the winter months. Fullriver’s suggested chargers are meant to be used safely with AGM technology and may help to keep your batteries in perfect condition throughout the year.
Don’t Forget About Load Testing
It is a good idea to do load testing of your AGM batteries before the cold season comes in. This allows us to find the potential issues such as internal resistance, low capacity, or voltage instability – the issues that may not be obvious in warm conditions but be crucial in the cold. Regular testing will make sure your batteries are ready to work under stress when temperatures drop and the demand for power increases.
Performance Tips for Cold Starts
If you are using AGM batteries for starting purposes – in vehicles, UTVs, or snow machines, ensure the connections are clean and corrosion-free. Poor terminal contact has a greater effect when the weather is cold. It also makes sense to allow the electrical system of your engine to settle down for a couple of seconds before cranking, particularly after a cold soak.
Final Thoughts
The cold weather should not necessarily be a problem for your AGM batteries. With adequate preparation, that is, proper installation, regular charging, and protection, you can minimize the negative impacts of freezing temperatures to a great extent. Be it plowing through a blizzard or just putting your equipment away for the off-season, maintaining your batteries in the winter will help them be there for you when you need them the most.
Our AGM batteries at Fullriver are designed with performance and durability in mind, even in harsh winter weather. If year-round reliability is what you’re after, begin with the proper battery and use these winter care tips to get the most out of your purchase.
