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

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.

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

I got a Harman kardon bluetooth speaker in an apartment someone had left when they moved out. Order this to see if it would fix it and now I have tunes when I'm out on the canoe

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.

I bought one for both my speakers now they both hold charges

My Harmon Kardon became a wall-powered speaker after years of abuse. This battery and kit brought it back to life! It's great that I can now bring my speaker along with me and not have to be tethered to a wall anymore. Would recommend or buy again after the battery loses its capacity.

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.

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