| Non maintenance-free batteries (without „magic eye“) |
| Lead-acid batteries which are not maintenance-free are filled with liquid electrolyte (wet battery). They are fitted with sealing plugs. |

WARNING | Risk of injury when handling electrolyte. |
| Observe warnings and safety regulations → Anchor. |
| Risk of explosion due to gas produced when charging battery. |
| Observe warnings and safety regulations → Anchor. |
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