- 1). Disconnect the positive (red) and negative (black) cables from your car battery using a wrench. Move the cables safely away from the battery.
- 2). Place your battery charger as near to your car battery as possible. Connect the negative cable attached to your battery charger to the negative terminal of your car battery.
- 3). Connect the positive cable attached to your battery charger to the positive terminal of your car battery. Make sure both cables are secure.
- 4). Plug your battery charger into an electrical socket. Set the charge rate to trickle charge. The charger will be on for many hours, so if it's outside, protect it with a suitable cover.
- 5). Turn on the battery charger and leave to charge your car battery for at least 12 hours. It may take longer, so it's a good idea to leave the charger on overnight.
- 6). Turn off the battery charger once the battery has been charging for a minimum of 12 hours. Some battery chargers have an indicator telling you when your car battery is fully charged. Move the charger away from your car.
- 7). Reconnect the positive and negative cables to the positive and negative terminals of your car battery. The terminals are marked with "+" and "-" symbols. Some terminals are also color-coded red and black to match the color of the battery cables. Make sure that you do this correctly or you will damage the car's electrical system.
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