Profile: Auto-Trol Limited manufactures battery charger control boards for forklifts and industrial needs. Some of the standard features of our control boards are automatic start/stop, color status indicators, field adjustable limits, over voltage shutdown and manual auto equalize. The AT-100 control board has optional features such as spike charge limiting, time retention latch, double contact relay and remote delayed start. The AT-100E control board has auto equalize and spike charge limiting as standard features.