Mercedes S-Class W-220

since 1998 of release

Repair and car operation

W220 Mercedes
+ Mercedes-Benz Cars of a class S (W220)
+ Operation manual
+ Routine maintenance
+ Engine
+ cooling and heating Systems
+ Power supply system and release
- Engine electric equipment
   + ignition and engine management System
   - Charge and start systems
      The storage battery - the main data and acquisition of the new battery
      Check and charging of the storage battery
      Storage of the storage battery
      Charging system - general information and security measures
      Check of system of a charging
      System of start of the engine - the general information and precautionary measures
      Check of system of start of the engine
+ Automatic transmission
+ Power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Cхемы

Check and charging of the storage battery

The low-served storage battery


1. If annual run of the car is insignificant, for check of a zaryazhennost of the accumulator each three months it is necessary to measure electrolit density. Measure density by the areometer and compare the received result with given in the table presented below.

Keep in mind that data are provided for electrolit temperature 15°С. At increase in temperature at everyone 10°С it is necessary to add on 0.007, at similar reduction — to read on 0.007.
2. If the condition of the battery causes fears, check electrolit density in everyone bank. The difference on more than 0.040 indicates loss of electrolit or damage of plates.
3. If the difference in density exceeds 0.040 aккумулятор is subject to replacement. If the difference in density satisfactory, but the battery is discharged, it it is necessary to charge and check electrolit density. The sequence of actions at a charging is given below.

Unattended storage battery


1. If on the car the tight storage battery is established, to check density of electrolit and to restore its level it is impossible. The condition of the battery can be checked by means of the built-in indicator or the external voltmeter.
2. Some models are equipped with unattended batteries which case the indicator of degree of a zaryazhennost is built in. It is located from above and changes the color at change of degree of a zaryazhennost of the battery. If the indicator has green color, the battery is completely charged, if the indicator red - the battery has to be charged. The sequence of actions at a charging of the battery is given below in this Section. Batteries of other producers too can have the built-in indicator of degree of a zaryazhennost. In this case follow the instructions provided in the maintenance instruction of the storage battery.

Storage batteries of all types


1. At battery check by means of the external voltmeter connect it to plugs and compare the received result to the data provided in Specifications. The result of measurements will be true if the battery was not charged at least within the last 6 hours. If it was charged - include for 30 seconds of a headlight, then wait for 5 minutes and check tension on plugs. All other electric equipment (including even vnutrisalonny lighting) should be thus included.
2. If result of measurements less than 12.0 In, the battery is discharged, and tension from 12.0 to 12.4 signals about a partial razryazhennost.
3. If the battery is necessary for charging, remove it from the car (address to the Section Check of a condition of the battery, care of it and a charging) and charge, following the procedure described below.

Check of fastening of plugs of the storage battery and holder


If the storage battery is badly fixed or plugs are not fixed, premature failure of the battery because of vibration, ignition of cables or malfunction in electric equipment work can become a consequence. As at not attached batteries are erased the memories given of electronic blocks, for example, a radio receiver, familiarize with remarks on removal and installation of the storage battery, thus address to the Section Check of a condition of the battery, care of it and a charging.

1. Move plugs of the storage battery in different directions and check reliability of their fastening, if necessary tighten.
2. If the storage battery is badly fixed, tighten a bolt of fastening the moment of 20 H • m.

Check of the storage battery under loading


1. Attach to battery plugs the voltmeter.
2. Start the engine and check tension.
3. At the moment of engine start at completely charged batteries tension should not fall below 10 In (at electrolit temperature near +20°С).
4. If tension sharply falls and the electrolit density in various sections is various, the battery is damaged and it is necessary to replace it.


The sequence of actions given below can differ from recommended by the producer of the accumulator established on the car. In this case use recommendations of the producer.

The ordinary and low-served storage battery


1. To charge the battery follows a current equal of 10 % from capacity (for example if the capacity of the battery makes 45 And · h to charge it follows a current of 4.5 Amperes) until within 4 hours the electrolit density in banks will not increase.
2. On the other hand, the automatic charger with a current about 1.5 amperes can be left included on all night long.
3. Accelerated chargers of type which, allegedly, can charge completely the accumulator in a couple of hours, it is not recommended use, as at big currents of a plate of the battery can overheat and collapse.
4. At a charging of the battery watch, that the temperature of electrolit did not exceed 37.8°С.

Charging of the unattended battery


1. The full charging of the battery of this type will need bigger time, than for a charging low-served or usual. Duration of a charging depends on degree of a razryazhennost and can borrow about three days.
2. The tension developed by the charger, should lie in a range 13.9 - 14.9 volts, the current should not exceed 25 amperes. Under existing conditions the battery can be used in 3 hours, tension on plugs should be about 12.5 volts. Achievement of a full charging will take longer time.
3. Before a charge of the storage battery familiarize with remarks on the security measures given in the Section Check of a condition of the battery, care of it and a charging:

· Do not disconnect the storage battery at the working engine.
· Never close the battery накоротко, i.e. do not connect positive (+) and negative poles (-). Thus the battery is warmed up and can burst.
· Do not use near the battery an open flame. The electrolit is poisonous. Do not allow its hit in eyes, on skin and on clothes. Otherwise plentifully wash out electrolit water.
· At the battery with central gazootvody, at a charge, a stopper (crosswise shlitsa) do not turn out.
· Before a charging of the frozen battery let's to it be defrozen. The charged battery freezes at temperature near 65°С, the semi-charged battery at temperature near 30°С and discharged at temperature near 12°С. After thawing the battery check on existence of cracks. If necessary replace.
· At a battery charge the normal charger or the device with the accelerated charging remove the battery. At least, disconnect the negative (-) and a positive cable (+).
· At use of the portable charger (a small current) the charging can be carried out without battery removal. A connecting cable to an onboard network to disconnect thus it is not required. It is necessary, naturally to consider data of the manufacturer of the battery.

Charging of strongly discharged and sulfatirovanny storage battery

The storage battery, long time not used (for example, at long parking of the car), is discharged and сульфатируется over time.

If tension of idling of the battery lies below 11.6 In, the battery is considered strongly discharged. Check tension of rest, thus address to subsection “Check of the storage battery”.

At strongly discharged battery of electrolits consists almost of one water.

At negative temperature such battery can freeze, and the case of the battery to burst.

Strongly discharged battery сульфатируется, i.e. on a surface of electrodes large low-soluble crystals of sulphurous lead are formed. The electrolit thus loses transparency and gets weak white coloring.

If strongly discharged battery is charged directly after the category, the sulfatatsiya occurs again. Otherwise plates of the battery continue to harden and possibility of a charge of the battery for a long time remains limited.

Strongly discharged and sulfitirovanny battery should be charged by the lowered current about 5 %, i.e. at, for example, capacity of the battery 60 of Ach force of a charging current should make 3 And.

Tension of a charge should make no more than 14.4 Century.

By no means it is impossible to charge strongly discharged battery the device for a fast charge.

The fast charging/the help at start

The device for a fast charge charge the battery only for ensuring start of the car. Thus force of a charging current makes 20 % and more from battery capacity. Thus the battery is damaged, since is exposed to influence of big currents. Time not used and strongly discharged battery is long it is not necessary to charge the device for a fast charge since it leads to a sulfatatsiya.