NYI[Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Speaker

Very clear directions and simple process. Took me 10 minutes to replace the battery on my Onyx 4 and it works great. Comes with everything you need.

Works great! My two Onyx 3 speakers were down to 30 minutes playtime. It took less than 10 minutes with each speaker to put in the new batteries. The screws on the Onyx 3 are standard Phillips. I’ve only tested one so far because after 5 hours it was still playing strong, I believe the second speaker will be just was strong. With the Onyx 3 the battery case screws are slightly shorter than the speaker case screws, just keep them separate.

Easy to install and works perfectly

I used the product to replace the existing battery in my Harmon Karbon it works perfectly

Fit well and was the easiest repair I've ever performed. Am very pleased with this repair kit that gave new life to my favorite speaker.

This was a perfect replacement for a Harmon Kardon Onyx Bluetooth speaker. It has a larger capacity and requires a longer charge, but that is fine with me.

Instructions were clear and easy to follow, with tools included with the battery. Excellent.

Bought April 2023 on it started failing after a year. At the end of December 2024 it’s not holding charge and having the speaker plugged in to power will sometimes turn on