Do I need to "top off" the battery if it is fully charged?

It's sensitive. It's cries a lot if not hugged properly (injector lines not alternately tightened. It stamps it feet (noise and vibration). And it can play the greatest cold-shoulder game (no start) on the face of the earth. But for it's size the motor is a hot tamale. It adopted me. Yotta see the Magnetti Marelli starter motor. It insists it is a Stradivarius and if you hit a sour note taking care of it, it'll screech like a Mexican fiddle.