So what is taking out the fuse? Place I worked a while back, we had a chair lift on stairway with gelcels. Always on trickle charge when parked. Was rarely used. Killed batteries in about a year if we didn't manually turn power off/on. If we didn't change them (no indicator to tell you either) and it tried to run on dying battery - it took out the control board. You think batteries are expensive? :BangHead: