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How to charge a battery

How to charge a battery A typical battery charger, fitted with a charge gauge (ammeter). Clip the red positive (+) charger lead to the positive (+) terminal. The high and low charging-rate switch. The ammeter gauge shows the rate of charge. Clip the black negative (-) charger lead to the negative (-) terminal. Make sure that the crocodile clips are fixed securely and not liable to be knocked off by accident. If the charging rate is much more than 4 amps, take off the cell caps or covering trough to assist the gas to escape.