WebClamp the positive (+) lead from the charger, usually coloured red, to the positive battery post. Clamp the negative (-) lead, usually black, to the negative terminal . Plug the charger into the mains and switch on. The … WebIn general, it usually takes around 12 hours to fully charge a car battery with a charger at a slow and steady rate. If you’re jumping the car, it usually is instantaneous to get …
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