Yuasa yu power 12volt battery checker ypctestmc yuasa ypctestmc p the yuasa yu power 12v battery checker is the easy way to show you the state of the charge in your battery the ring connector can be left permanently connected to battery allowing tester or charger to be connected using vehicle type plug p p to check battery condition p p 1 hook red ring terminal from analyzer to positive br 2 hook black ring terminal to negative battery terminal br 3 push button to determine