Battery charge (Mercedes-Benz S-Class W126)

Do not allow a short circuit in the battery circuit under any circumstances, as this may cause it to heat up and explode. The electrolyte in the battery has a high corrosive capacity and may come into contact with the skin or eyes. If the body is affected by the electrolyte, the affected areas of the body should be thoroughly washed with water.

Remove the positive and grounded wires from the battery, and first remove the ground wire (mass).

Before charging the battery, check the electrolyte level and, if necessary, restore it to normal by adding distilled water to the battery.

Defrost a frozen battery before charging it. A charged battery freezes at about -65°C, a half-charged battery at about -35°C, and a discharged battery at -12°C.

Unscrew the battery element caps and leave them lying on the holes. The caps will prevent the electrolyte from splashing out and at the same time allow the gases formed during the battery charging process to pass through.

Charge the battery only in a well-ventilated area. If you are charging a battery installed in a vehicle, open the hood.

The charging current of a normally charged battery is approximately 10% of its nominal capacity (in the case of a 45 Ah battery, the current should be approximately 4.5 A).

Connect the positive battery terminal to the positive terminal and the negative battery terminal to the negative terminal of the charger.

During the battery charging process, the electrolyte temperature should not exceed 55°C; if necessary, interrupt the charging process or reduce the charging current.

Continue charging the battery until gas begins to escape from all elements and the electrolyte density and battery voltage do not increase when taking three measurements with an interval of one hour between them.

The battery can be charged in fast charge mode.

Note: In an emergency, use only the fast charger. The specified fast charging mode cannot be used for new batteries or batteries that have not been used for a long time.

Check the electrolyte level after the battery has been charged. If necessary, restore it to the required level by adding distilled water.

Check the density of the electrolyte. If the density of the electrolyte in one of the elements is noticeably lower than in other elements (for example, in five elements the density is 1.26, and in one element 1.18), replace the battery. Let the battery rest for about 20 minutes, then tighten all the element caps.