| Maintenance-free battery with liquid electrolyte (wet battery). These batteries have a cover over the cells instead of cell plugs. The cover seals the battery after initial filling during production. |
Warning | Never under any circumstances remove the cover for the battery cells. The battery housing will be damaged and the battery is therefore unusable. |
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| Lead-acid battery, where electrolyte need not be topped-up with distilled water under normal conditions. This term is normally used for batteries with a predetermined amount of electrolyte. |
| These batteries are often equipped with a magic eye. The magic eye provides information concerning the level of the electrolyte and the charge state of the battery. |
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