rapthor3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker

Overall, I am pleased. Let me first say that the directions included did not support the Onyx 4. However, this was a pretty easy battery swap. Back screws are under the grommets that hold the screen. Didn’t need the driver that came with it. Just use a standard small Phillips driver. Battery came charged. My speaker was back to normal in a few minutes. Keep in mind that this is a smaller battery than that of the original as far as physical size. However, even if it doesn’t last as long, which it may, I’m very happy with this battery. I missed my portability. No issues here so far.

Took speaker to batteries plus...they dint think it was possible...ordered this kit.has everything i needed including good instructions.surprised me how easy it was.

it works better than the original battery and the wire is connecting it to the circuitboard I just as heavy as some of them were cheap wire wouldn't carry the amperage

This was for a HK Onyx Studio 4 speaker only. Battery is slightly smaller than original but the adhesive foam cushioning takes up the difference in size, I also used pieces from the original battery to use as cushioning where wires get passed thru the battery housing. Supplied screwdriver and plastic tool were not any help for the Onyx 4, as screws are regular philips screws and there is no notch to use the plastic tool to pry the speaker cover off. I used a knife edge to get the prying started then used Nylon auto trim tool set to complete the removal. Gave a Four Star rating because two tools given do not help. Battery worked immediately when all hooked up but I am not sure how long it will last after charging.

Just what I was looking for. The product came with all the needed tools required to switch out the battery. I would definitely recommend this product.

Don't buy this battery. I tried using this battery on my HK onyx studio 4. It appeared to charge . Tried using it the next day and it did not work.

Good price for battery. Included tools and instructions for removing old battery and installing new battery. New battery has a higher capacity and fits perfectly in my Harmon Kardon Onyx 4 speaker.

My Harman/Kardon Onyx speaker is one of my favorites for rocking the bass while playing games or music. Yes, it is old now, but still worked great, except for one thing: the original battery no longer charged, so I was stuck with having to place the speaker near an AC source. Well, I finally got tired of that, so I looked for a replacement battery. This one got good reviews, had the necessary tools with it, was readily available, and was priced right. I'm listening to my wireless BT speaker right now, while I write this review. Very happy. If anything goes wrong, I'll let you know.