How to replace the battery on a Tomtom Runner 3 / Spark 3 - YouTube
Battery for TomTom Spark Cardio+ Music GPS Watch New Li Polymer Rechargeable Accumulator Pack Replacement 3.7/3.8V AHB332824HPS|Digital Batteries| - AliExpress
MPF Products 280mAh PP332727 Battery Replacement Compatible with Tomtom Spark 3 GPS Activity Tracker and Fitness Watch