Keep your truck GPS powered and ready with this replacement Li-Polymer battery designed to restore dependable portable runtime on the road. Built with a 3.7 V output and 1000 mAh capacity, it helps reduce unexpected shutdowns and frequent recharging during long-haul routes, daily deliveries, and extended navigation sessions. Engineered for a precise fit and straightforward installation, it is a practical way to refresh performance when an older battery no longer holds a charge. Compatible with Rand McNally TND-540 / TND540 Truck GPS Navigator. Disclaimer: This is not an Original Equipment Manufacturer (OEM) product, HQRP branded product is a replacement. All brand names and logos are registered trademarks of their respective owners. Any use of the brand names or model designations for this product are made solely for purposes of demonstrating compatibility.