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Amazon.com: Synergy Digital Smartwatch Battery, Works with FitBit Charge 2 Smartwatch, (Li-Pol, 3.7V, 70 mAh) Ultra Hi-Capacity, Compatible with FitBit Charge 2 Battery : Cell Phones & Accessories
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Smartwatch Battery For Fitbit LSSP411415 Charge 2 Capacity 60mAh / 0.22Wh Color Black Type Li-Polymer 3.70V - AliExpress
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