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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 : Sports & Outdoors
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Amazon.com: Synergy Digital Smartwatch Batteries, Works with FitBit Charge 2 Smartwatch, (Li-Pol, 3.7V, 70 mAh), Compatible with FitBit Charge 2 Battery, combo-pack includes: 2 x SDWT-P1708 Batteries : Cell Phones & Accessories
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