Storage of the battery (VW Polo 4)

If the car is not used for two months, the battery must be removed and stored in a charged state. The most favorable storage temperature is 0... +27°C. At this temperature, the intensity of self-discharge of the battery is minimal. To avoid aging of the battery, it must be recharged approximately once every 2 months during storage.

When a battery that has not been used for a long time is charged with a fast charger, it does not accept the charging current or, due to so-called shallow charging, shows signs of being fully charged too quickly. Apparently, such a battery is defective.

Before declaring the battery faulty, it must be checked:

• Check the density of the electrolyte. If the density of the electrolyte in individual elements differs by no more than 0.04 g/ml, then the battery should be charged in the normal operating mode of the charger.
• After charging, check the battery operation under load, see the relevant chapter above. At the service station, a special measuring device is used for this. If the measured voltage is below 9.6 volts, the battery is faulty.
• If the density of the electrolyte in one or two adjacent elements has noticeably dropped, then the battery has a short circuit and is faulty.
• Charging a deeply discharged and sulfated battery is described in the relevant chapter above.

(The original article is posted on the website: vwmanual.ru)