Four year old fully charged deep cycle van battery. The tester said to replace; The state of health (SOH) is only 50% even though the state of charge (SOC) is 98%. I forgot that this battery requires NO maintenance. Electrolyte levels were below the top of the plates. Topped up with distilled water and used the smart charger recovery mode. After the first cycle I used this tool again and the battery performed well at 89% SOH. Next time the battery performed well with 91% SOH. The third time is good at 95% SOH. I am now on my fourth recovery cycle. I wouldn't have figured it out without this tool. A trip to the auto parts store for a check would cost me over $100 for a new battery. I'm glad I can restore my old battery instead.
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