Checking the electrolyte level in the battery

Most often, your Mondeo leaves the factory with a maintenance-free lead-calcium battery (Sa) on board. Its service life is highly dependent on operating conditions: any start of a cold engine, predominantly driving short distances with a large number of stops at traffic lights, as well as driving in mode «Stop-and-go», any additional consumer (air conditioning, heated front and rear windows, interior ventilation, headlights, etc.) affect the electric battery more than regular flights over long distances. But still, new batteries can last from two to three years. If you must equip your Mondeo with a new battery, Ford mandates the use of a Ca battery. If you still decide on a cheaper spare battery with serviceable cells, then from time to time you should check the battery electrolyte. The electrolyte is sulfuric acid diluted with distilled water.

High ambient temperatures or a defective voltage regulator bring this mixture out of equilibrium - the water evaporates. During a long standing period, the battery automatically discharges itself. This may also lead to «lack of water», as well as a deep discharge of an external current consumer (e.g. refrigeration unit in the cigarette lighter). Top up the required volume only with distilled water - tap water, like boiled water, contains conductive salts and other mineral substances that have a negative effect on the battery. IN «service-friendly» accumulators «evaporative» water condenses in the pipeline labyrinth above the cells and remains in the accumulator.

PROCEDURE

The electrolyte level in the case must reach at least the mark «MIN» (plates must be well recessed). You can add small doses of acid. To do this, unscrew or bend the locking plug on top of the battery cover. Bring the missing volume of the charged battery to the top stroke (approx. 15 mm above the plates) with distilled water. Top up a heavily discharged battery until the plates are covered - the acid level rises during the charging process. If necessary, add the missing volume up to the mark «MAX». Never overfill the battery - acid will leak out of the plug or side vents. This will lead to «blooming» corrosion and the formation of white acid crystals both on the surface of the battery and near its location. Using a brass brush, carefully remove the crystals and then rinse off this «dirt» plenty of water. Do not forget to disconnect terminal 31 first (minus pole) battery.