we all know that the alkaline batteries that most people use in their pinball machine AA battery holders have a tendency to leak after a while and cause havoc to the board. i was thinking with modern battery technology being what it is, why do we have to use alkaline batteries. has anyone thought of using NMHI batteries, specifically LSD (low self discharge)? i have read that NMHI batteries are more of a dry type of cell and that they will not damage the board if they fail. i ask this question because my data east WWF still has the battery holder mounted on the board. right now it has alkaline batteries, and while they are fairly new, the still pose potential problems in the future if not changed out in time. from what i have read NMHI LSD batteries hold their charge for nearly a year. i have one in my clock out in garage and after months its still ticking away. i personally do not like using alkaline batteries and i know what the potentail problems this can cause.