What is the maximum charging voltage for an AGM battery?
1 Answers
AGM battery charging voltage must not exceed 14.5V. AGM stands for Absorbent Glass Mat battery. Vehicles equipped with engine start-stop systems mostly use AGM or EFP enhanced maintenance-free lead-acid batteries. Compared to conventional batteries (traditional lead-acid batteries), AGM batteries feature more advanced technology, better handling the stress of frequent engine starts and increasing electrical loads in automotive batteries. During charging, it's important to note that the charging limit voltage is only 14.5V, whereas conventional batteries allow 15.5V. When selecting a charger, choose one specifically designed for AGM batteries. The theoretical lifespan of AGM batteries is approximately 4 to 6 years, while EFP batteries have a theoretical service life of 3 to 5 years. Actual service life is directly influenced by driving habits, usage environment, and external temperatures.