1. In winter conditions, when the battery operates under high loads when starting a cold engine and when most electrical equipment is in constant operation, it is recommended to fully charge the battery from an external source with a current of 3.5-4 A from time to time.
2. Charging with such a current is carried out until there is no increase in density within four hours.
3. You can also, without any risk, charge the battery overnight with a small current of 1.5 A using a charger.
4. It is not recommended to resort to "forced" charging, which supposedly restores battery power within 1-2 hours, as this can seriously damage the battery plates due to their overheating.
5. When charging the battery, ensure that the electrolyte temperature does not exceed 40°C.
Publication reprinted from this resource: MERCEDESMAN
Charging the battery (Mercedes-Benz E-Class W123)
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