What terminals do you use to charge a motorcycle battery?

The terminals are marked + plus for positive and - for negative. The charger normally has one red and one black wire with clamps, the red is for the positive and the black for the negative terminals. Be careful to check that the battery has the proper level of electrolyte and distilled water mix before charging it. Charging time depends on the state of the battery. Some old batteries may be nonchargeable. Be careful as batteries contain acid, ideally wear gloves and goggles.