Battery — charging (Opel Ascona C)

1. In winter, when the battery is under heavy load, for example, when starting the engine from a cold state, and also when most electrical equipment is constantly on, it would be a good idea to periodically fully charge the battery from an external source, with a current of 3.5 to 4 Amps.

2. Continue charging the battery at this current until the specific gravity of the electrolyte becomes constant over a period of 4 hours.

3. Alternatively, you can use a different charger, charging the battery at 1.5 Amps overnight.

4. Special high-speed charging devices, with widely advertised ability to bring the battery to a fully operational state in 1-2 hours, are not recommended for use, as they can cause serious damage to the battery plates due to overheating.

5. When charging the battery, please note that the temperature of the electrolyte should never exceed 38°C, and also remember that hydrogen gas is formed in the cells, and this gas is flammable and explosive, so do not smoke or use open flame near the top of the battery.

6. Please note the limitations regarding charging batteries that do not require topping up of electrolyte, described in Section 3.

7. Always disconnect the positive battery cable before connecting the battery to the charger.

[Text copied from an online resource opelbook.ru]