The YLB powers a RS board for anywhere between around 5 seconds to over 10 seconds when fully charged. The time depends on the volume of the sounds and the 'density" of the sounds. Obviously, a loud whistle blowing will deplete the battery faster as that consumes more power to generate the sound. The intent of the product was to allow continuous sounds for brief track power interruptions, and also for conventional operation to have continuous sound for direction changes. I've heard it complete shutdown sounds on some locomotives with power off, and cut them short on other locomotives when power was removed. I can only guess the ones that get cut off are pulling more power from the YLB.
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