Question: How to distinguish between good and bad lead-acid batteries that have been shelved for a long time

Label: Answer: For lead-acid batteries that have been left for a long time, you can judge the quality of the battery by measuring the open circuit voltage of the battery. Taking a 12V lead-acid battery as an example, if the open circuit voltage is higher than 12.5V, it means that the storage battery has more than 80% of energy storage. If the open circuit voltage is lower than 12.5V, it should be charged immediately. If the open circuit voltage is lower than 12V, it means that the battery stores less than 20% of the electric energy, and the battery is unusable.
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