Replacement for the Following Battery Model/Part Numbers: PR-633496. Intended for/Compatible with with the Following Harman Kardon Bluetooth Speaker Models: Onyx studio 3 (PLEASE NOTE: THIS REPLACEMENT BATTERY IS NOT COMPATIBLE WITH THE ONYX STUDIO 1, ONYX STUDIO 2 OR ONYX STUDIO 4 SPEAKER). 3.7V 2600mAh 9.62Wh Lithium-ion Rechargeable Battery Pack. Includes Free Installation Tools. 1 Year Replacement Warranty. MPF Products is a Registered Trademark. 2600mAh PR-633496 Battery Replacement Compatible with Harman Kardon Onyx Studio 3 Wireless Bluetooth Speaker.