Battery eye indicator color
Normally, that indicates the batteries are normal, low on charge or bad. (I've seen a few batteries that had a green eye, black eye, white(clear and bright) eye so this is assuming you have green-good, black-low and re-charge, white-check and replace battery)
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In case of green color, It means that one of the 6 (2.1 Volt) cells is green. Not all of them, personally I think this is a good feature.
Normally green would indicate a good battery-but remember the 'magic eye' is only indicating the condition of one
1. Green: battery is charged and the acid level is good.
2. Black: Battery is partially dis-charged and the acid level is good. Charge the battery.
3. White(Clear and bright): Electrolyte is nearly short. Do not charge or jump start. Replace battery.