HQRP Battery for Harman Kardon Onyx Studio / Onyx Studio-2 Studio-II / Onyx Studio-3 Wireless Bluetooth Speaker System + HQRP Coaster - Newegg.com
3400mAh High Capacity LI11B001F Battery Replacement Compatible with Harman Kardon Onyx Studio 1, Onyx Studio 2 Wireless Bluetooth Speaker - Newegg.com
3500mAh Replacement Battery For Harman Kardon Onyx Studio1, 2 Speaker Mini Bluetooth Speaker Battery Replacement, New High Spee|battery replacement| battery forbattery battery battery - AliExpress
Harman kardon Onyx battery upgrade - YouTube
3000mAh Battery Replacement for Harman Kardon Onyx Mini Wireless Speaker | eBay