3.7V 280mAh Rechargeable Li ion Battery For TomTom Spark 3 TomTom Spark Cardio II Smart watch High Quality Replacement|Replacement Batteries| - AliExpress
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