HQRP Kit: Battery and Charger for Harman Kardon Onyx, Onyx Studio Portable, Studio-2, Studio-3, Studio-4 Speaker ESX2567Q AU38AA-00 AU38AA-OO LI11B001F Wireless Speaker System AC Adapter plus Coaster - Walmart.com
Harman/Kardon Onyx 4 Onyx studio 4 Replacement Battery: BatteryClerk.com Speaker
Harman/Kardon Onyx studio 3 Replacement Battery: BatteryClerk.com Speaker