This hobby shop has been a favorite of ours ever since we discovered it by accident driving through the area years ago. It appeared in a Progressive Insurance ad that runs on TV a lot. See https://www.roi-nj.com/2021/03/03/lifestyle/tech-toys-how-old-time-store-in-parsippany-earned-starring-role-in-progressives-national-ad-campaign/. It surely carries a variety of batteries for radio-controlled vehicles - see the photo of a display case.