| Maintenance-free batteries |
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| Battery with „magic eye“ |
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| Checking battery with „magic eye“ |
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| Valve-regulated lead acid (VRLA) or absorbent glass mat (AGM) battery without „magic eye“ |
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| Checking valve-regulated lead acid or AGM battery |
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| Central gas venting system |
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| Battery terminal screw connection |
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| Visual inspection of battery |
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| Checking colour indicator (electrolyte level in battery) - batteries with „magic eye“ |
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| Checking electrolyte level in battery |
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