Electrolyte level - batteries with charge indicator (magic eye), checking

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Fig 1: Locating Magic Eye

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Electrolyte level on batteries with charge indicator - arrow - can be established from the color indication. Three different colored displays are possible:

color indicator	Battery status
Green	Battery adequately charged.
Black	Not charged or inadequately charged.
Colorless or yellow	Critical electrolyte level reached; topping up with distilled water essential, procedure → Electrolyte level - batteries with sealing plugs, checking