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Why does temperature have such a dramatic effect on VRLA batteries?
27 Aug 2021

Temperature is a major factor in battery performance, shelf life, charging and voltage control. At higher temperatures there is dramatically more chemical activity inside a battery than at lower temperatures. The following charts graphically illustrate this fact.


Typical Self-Discharge of VRLA Batteries at Different Temperatures



AGM Charge and Float Voltages at Various Temperature Ranges


Gel Charge and Float Voltages at Various Temperature Ranges



What is a thermal runaway?
The appropriate charge voltage depends on the battery temperature as mentioned above. A warmer battery requires a reduced voltage. If the voltage is not reduced, current accepted by the battery increases and when the current increases, the heating increases. This can continue in a loop feeding on itself with the battery temperature and charging current rising to destructive levels.
Gel batteries are much less susceptible to thermal runaway than AGM batteries. Batteries may become more susceptible with increasing age. Without a recombination reaction, flooded batteries convert most excess charging energy to gas, not heat. This makes them almost immune from the thermal runaway.
Thermal runaway can be prevented with:
• Temperature compensation monitoring at the battery—not at the charger.
• Limiting charging currents to appropriate levels .
• Allowing for adequate air circulation around the batteries.
• Using timers, or Ampere-hour counters.
• Using smart chargers that recognize the signature of a thermal runaway event which will shut the charger down.

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