What does the eye of the indicator and what is it for?
Eye-LED indicates the gravity of the electrolyte in only one of six cans. Therefore, to obtain complete information on the status of the battery, check the density should be in all six banks, as the figures in them can vary considerably. Eye of the indicator, is only an option attractive to consumers and is not responsible for the additional benefits of the battery. The indicator are not exact, but they can approximate the condition of the battery.