3400mAh LI11B001F Battery for Harman Kardon Onyx Studio 1, Onyx Studio 2 Speaker - Walmart.com
Amazon.com: Hixon Replacement Battery 3200mAh 3.7V for Harman Kardon Onyx Studio 4/3/2/1 Wireless Bluetooth Speaker : Electronics
Harman Kardon Onyx Studio 2 Battery
Onyx Studio 2 | Wireless Speaker System with rechargeable battery and built-in microphone
2600mah Battery 3.7v For Harman Kardon Onyx Studio 1 & 2 & 3 Player Li Polymer Rechargeable Accumulator Replacement+track Code - Digital Batteries - AliExpress