Storage of the battery (VW Transporter T4)

Batteries not used for a long time (for example, when putting a car into storage), self-discharge and may become sulfated. If these batteries are charged with a fast charger, they will not accept the charging current or will be quickly "fully" charged through so-called surface charging. They are defective.

Before recognizing them as faulty, it is necessary:

• check the density of the electrolyte. If the density of the electrolyte in all the cans differs by no more than 0.02 g/ml, then the battery can be charged with a regular charger;
• check the battery after charging for load. If the values are not maintained, it is faulty:
• if the density of the electrolyte in one or two adjacent cans differs greatly (for example, 5 cans show 1.16 g/ml, and one 1.08 g/ml), then the battery has a short circuit and is faulty.

To prevent battery aging, recharge the stored battery every 3 months.