Couple questions. I picked up the sima universal adapter set it for 5v and plugged in my jb3 which i have running through a sla 6v 12ah with a cig adapter on it running through the sima adapter. Question is my jb3 acts really weird, slow reacting and it will not shut down with the sla plugged in. Anyone else had this happen. Another question with the sima set at 5v 1.9ah or 4.2v 2.0ah the jb3 asks for 2.4ah 5v, which do you think is better?