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Amazon.com: 3.7V 250mAh Replacement Battery for Tomtom Spark 3 GPS Activity Tracker, Fitness Watch,PP332727 : Electronics
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3.7V 280mAh Rechargeable Li ion Battery For TomTom Spark 3 TomTom Spark Cardio II Smart watch High Quality Replacement|Replacement Batteries| - AliExpress
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300mAh Battery For TomTom Spark 3 Smart Watch Cardio II GPS Batterie Accumulator AKKU|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
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