The battery fluid should reach at least the lower of the two marks and at least cover the top edge of the plates well.
If the liquid level drops, unscrew the stopper. For some batteries, «maintenance-free according to DIN», there are special plugs:
Place a screwdriver on the underside of the cover and press up «head» traffic jams. Unscrew the bottom with tongs.
With a normally charged battery, add distilled water to the upper mark («MAX») or 15 mm above the top edge of the plates.
If the battery is very low, then add as much water as needed to cover the plates. When charging, the liquid level rises significantly.
Top up with distilled water to the upper mark only after charging the battery.
The amount of water to be added must be well metered, otherwise the accumulator will be overfilled.
Full battery «spills over the edge», acid protrudes from under the plug and causes corrosion and acid crystals on the surface of the battery and in the place of its placement.
Use distilled water!
Acid must never be added to the battery, but only demineralized acid can be added (ion exchange) water, commonly referred to as distilled water. Tap, rain and boiled water contains electrically conductive salts and other minerals that are harmful to the battery.
If you don't get free battery water at your regular gas station, it's cheapest to buy it from a drug store or pharmacy. Packaged distilled water at a gas station is often significantly more expensive.
Into the viewing window (arrow) battery «Freedom», maintenance-free, you can identify the state of charge of the battery:
1 - green dot in the center of the acid concentration sensor: the ball in the cage is located directly in front of the synthetic rod, the battery is at least 65% charged.
2 - dark center: the ball is not in front of the synthetic rod, the charge is less than 65%.
3 - light or light yellow center: the acid level in the battery has dropped below the synthetic rod. If you have difficulty starting the engine, replace the battery.
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