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Samsung Gear S2 3G Battery
Synergy Digital Smartwatch Battery, Compatible with Samsung Gear S2 Classic Smartwatch, (Li-Pol, 3.7V, 250mAh) Ultra High Capacity, Replacement for Samsung EB-BR720ABE Battery - Walmart.com
Eb-br720abe Original Size Battery 250mah For Samsung Gear S2 S2 Classic R720 Gear S2 Classic R732 Smart Watch Batteries +tool - Mobile Phone Batteries - AliExpress