Shuttle work is hard on batteries
A staff or school van idles at pickup points with the air conditioning running, the door opening and closing, and the engine restarted many times a shift. The alternator rarely gets a long run to catch up. In UAE summers that duty cycle finishes batteries sooner than private use would, so a heavy-duty unit with good cycling tolerance is the sensible choice, and a quick test every few months catches a weak one before it strands passengers.




