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| The magic eye -arrow- is used to get information on the electrolyte level and the battery's charge status |
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| There are three different colours: |
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| Green → sufficiently charged battery. |
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| Black → battery either discharged or insufficient → Chapter, Battery: charge. |
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| Colourless or yellow → the electrolyte is at the limit level, and distilled water must be added. |
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| If for production reasons the batteries have plugs they will be covered by plastic |
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