Quick Answer
Check your AGM battery's state of charge, age, and performance. If it's more than 5 years old, has low capacity or can't hold a charge, or shows signs of physical damage, it may need replacing.
Assessing Battery Age and Condition
AGM (Absorbent Glass Mat) batteries typically last between 5 to 7 years, depending on the type, usage, and storage conditions. Compare this to their original specifications and usage patterns to determine if replacement is necessary. For example, if your 5-year-old AGM battery was designed for 200 cycles and has exceeded 300 cycles, it’s likely nearing the end of its lifespan.
Monitoring the State of Charge
Regularly check your AGM battery’s state of charge to assess its health. Use a multimeter to measure the voltage, or connect the battery to a load tester to determine its capacity. A fully charged AGM battery should read 12.7-12.8 volts. If the voltage is lower than expected, it may indicate a decrease in capacity or internal damage.
Signs of Physical Damage
Inspect your AGM battery for signs of physical damage, such as cracks, swelling, or corrosion on the terminals. If you notice any of these issues, it’s best to replace the battery immediately to avoid potential safety hazards or performance problems.
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