TomTom on Twitter: "@MFergusonAuthor Hi, Watch batteries not holding charge can sometimes be caused by the operating software misreading the charge in the battery. Please apply the Factory Reset described in this
HQRP Battery Works with Tomtom Spark 3 Cardio GPS Watch PP332727 Spark-3 - Walmart.com
AHB332824HPS Battery for TomTom Spark Cardio + Music GPS, 200mAh - sold by smavc 760412478995 | eBay