Rapthor 3500mAh Rechargeable Replacement Lithium Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth 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.

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.

Perfect fit. My speaker is working again without the power cord. Watch YouTube videos for instructions on how to install.

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.

Great replacement option. For the onyx 4 you do not need the screwdriver that comes with the kit. It uses normal Phillips screws. Easy to change out and much better life than the original factory battery that had since died on me.

I only type reviews on something that really sucked or something that went above and beyond. this is how all products should be. specialty tools and step by step readable instructions included and a battery that fit and worked like it should. Harman/Kardan informed me battery was not replaceable and wanted me to buy a new speaker. price of 479.00. but did offer me 20% off new one.. the original batteries don't last long and can cause issues when dying.

A waste of time and money. I bought this 3500mah to replace the original battery in my Onyx 3. After installing the switches lit up so I was happy and tossed the old battery. I put it on charge overnight with the original HK charger. Next day I established a bluetooth connection and enjoyed some some long awaited jams. After about 5 minutes the power button flashes the red low battery warning. This Battery is not charging. If I had not thrown away the old battery I would send this junk back for a refund.

Very good quality , l love this battery

It's replaced and doing well