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| The electrolyte level and the state of battery charge can be checked through the viewer -arrow-. |
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| There are three different colours: |
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| Green → sufficient battery charge. |
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| Black → discharged or insufficiently charged battery → Chapter. |
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| Colourless or yellow → the electrolyte has reached an extreme level and distilled water must be added. |
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| If for reasons of production the battery has caps, they will be covered with plastic. |
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