Hello Henry, If you are thinking the battery will will keep the engine moving when the rollers hit a dead space, unfortunately it won't. The purpose of the battery is to keep the sound going primarily in conventional mode when the direction button is pressed or when the power to the track is shutoff and the engine can complete the shutdown sequence.
Best bet is to add additional rollers to the tender if it's a steam engine or change the arrangement of the switches to alleviate the dead spot.
I went back to layout and did some more testing and discovered that the sounds stop as well. earlier I had the sound off