---
product_id: 358353816
title: "Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker"
brand: "rapthor"
price: "€ 26.75"
currency: EUR
in_stock: true
reviews_count: 8
category: "Rapthor"
url: https://www.desertcart.it/products/358353816-rapthor-3500mah-rechargeable-replacement-battery-compatible-with-harman-kardon-onyx
store_origin: IT
region: Italy
---

# 3500mAh High Capacity Easy Quick Install Kit Built-in Safety Circuit Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker

**Brand:** rapthor
**Price:** € 26.75
**Availability:** ✅ In Stock

## Summary

> 🔋 Recharge your vibe, keep the party alive!

## Quick Answers

- **What is this?** Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker by rapthor
- **How much does it cost?** € 26.75 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/358353816-rapthor-3500mah-rechargeable-replacement-battery-compatible-with-harman-kardon-onyx)

## Best For

- rapthor enthusiasts

## Why This Product

- Trusted rapthor brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First, Always:** Integrated protection against overcharge, discharge, and short circuits.
- • **Perfect Compatibility:** Tailored fit for Harman Kardon Onyx Studio 1 through 4 models.
- • **Power That Lasts Longer:** 3500mAh capacity outperforms the original for extended playtime.
- • **Hassle-Free Installation:** Includes screwdriver and plastic tool for a seamless battery swap.
- • **Engineered for Durability:** Foam cushioning and reinforced wiring ensure lasting, reliable connection.

## Overview

The Rapthor 3500mAh Rechargeable Replacement Battery is a high-capacity, safe, and durable power solution designed specifically for Harman Kardon Onyx Studio 1-4 wireless Bluetooth speakers. It features easy installation tools, enhanced wiring protection, and built-in safety circuits to ensure reliable, long-lasting performance that revives your speaker’s portability and sound experience.

## Description

Buy Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker: Portable Bluetooth Speakers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Perfect for for my speaker - Perfect fit. My speaker is working again without the power cord. Watch YouTube videos for instructions on how to install.
Review: Onyx 4 Replacement - 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.

## Features

- 3500mAh High Capacity: Higher capacity than original battery, longer-lasting performance.
- Easy to Use: Simply quick install with included screwdriver and plastic tool.
- Considerate Details: Foam strip for cushion absorbing, durable and longer than original’s battery wire for better connection, sponge tape well protects the connector wire from damage.
- Safe Performance: Built-in protection circuit well protects the rechargeable battery from over-charge, over-discharge, short-circuit.
- Compatibility: Compatible with Harman Kardon Onyx Studio, Onyx Studio 2, Onyx Studio 3, Onyx Studio 4.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B099NJVQQ7 |
| Batteries | 1 Lithium Ion batteries required. (included) |
| Best Sellers Rank | #62,100 in Electronics ( See Top 100 in Electronics ) #1,559 in Portable Bluetooth Speakers |
| Customer Reviews | 4.4 4.4 out of 5 stars (325) |
| Date First Available | July 16, 2021 |
| Item Weight | 3.84 ounces |
| Manufacturer | MSW (Shenzhen) Technology Limited |
| Product Dimensions | 6.7 x 3.55 x 1.15 inches |

## Product Details

- **Brand:** rapthor
- **Color:** Black
- **Compatible Devices:** Compatible with Harman Kardon Onyx Studio 1/2/3/4
- **Compatible Phone Models:** Compatible with Harman Kardon Onyx Studio 1/2/3/4
- **Connector Type:** wireless
- **Included Components:** Install tool, Replacement battery, Screwdriver
- **Input Voltage:** 3.7 Volts
- **Number of Items:** 1
- **Special Feature:** Easy to Install, Higher Capacity, Short Circuit Protection
- **Wattage:** 12.95 watts

## Images

![Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker - Image 1](https://m.media-amazon.com/images/I/716QlRKgC-L.jpg)
![Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker - Image 2](https://m.media-amazon.com/images/I/71w4aAwGlHL.jpg)
![Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker - Image 3](https://m.media-amazon.com/images/I/71tBrEvyFDL.jpg)
![Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker - Image 4](https://m.media-amazon.com/images/I/71oNlwyPlPL.jpg)
![Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker - Image 5](https://m.media-amazon.com/images/I/71gzhpaBbzL.jpg)

## Questions & Answers

**Q: Any feedback after using it for a while?**
A: Sorry charged after it arrived and haven’t used it.  So I don’t know how long it holds a charge

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect for for my speaker
*by H***O on August 13, 2025*

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

### ⭐⭐⭐⭐⭐ Onyx 4 Replacement
*by M***B on February 13, 2024*

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.

### ⭐⭐⭐⭐⭐ Good replacement for the original battery!
*by Q***E on March 9, 2024*

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.

## Frequently Bought Together

- Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker
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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-02-25*