Extend the Life of Your RV’s Battery
Some of the common causes of premature battery failure include overcharging; undercharging; deep discharges; excessive vibration; and calcium or magnesium sulfation from using tap water.
When charging your RV battery during hot temperatures, be careful not to overcharge it. The gassing threshold for most lead acid batteries is a source 14.1V to 14.4V at room temperature. When charging a battery when the ambient temperatures are high, gassing can occur at lower charging rates. What happens if your charging system cannot compensate for temperature? You’re likely to get excess amperage that can cause the water to “boil” out of the battery.
The result of overcharging is a loss of water. When adding water to a battery, it’s important to use distilled water; tap water will cause calcium and magnesium buildups. In an emergency, use rainwater. Avoid overfilling the cylinder – especially in hot weather. The heat will cause the water volume to expand and spill out, causing corrosion.
Undercharging can also cause problems with your battery. If the battery is not fully charged, residual sulfur can build up, decreasing the battery’s storage capacity.
Deep cycling your batteries (80-100%) on a regular basis is another culprit to a short battery life. You should also avoid shallow discharges (less than 10%) on a regular basis. To extend the life of your battery, use 25% to 50% of the storage capacity.
During hot weather, it’s important to perform routine preventative maintenance on your batteries. Keep the battery top clean: the cable mating surfaces and posts and terminals free from corrosion and tighten the cable connections and retention alternating belts.
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