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Kratax Upgraded 3500mAh Replacement Battery for Harman Kardon Onyx Studio 1/ 2/3/4 Speaker, Real Capacity HK Onyx Battery, Same Quality As Original Battery for HK Onyx Studio Wireless Bluetooth Speaker - Newegg.com
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NeweggBusiness - 3400mAh High Capacity LI11B001F Battery Replacement Compatible with Harman Kardon Onyx Studio 1, Onyx Studio 2 Wireless Bluetooth Speaker
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3500mAh Rechargeable Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker - AliExpress
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