---
product_id: 406102328
title: "Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker"
brand: "rapthor"
price: "KD 19.50"
currency: KWD
in_stock: true
reviews_count: 5
category: "Rapthor"
url: https://www.desertcart.com.kw/products/406102328-rapthor-3500mah-rechargeable-replacement-battery-compatible-with-harman-kardon-onyx
store_origin: KW
region: Kuwait
---

# 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:** KD 19.50
**Availability:** ✅ In Stock

## Summary

> 🔋 Power up your Onyx Studio and never miss a beat!

## 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?** KD 19.50 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/406102328-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

- • **Install Like a Pro:** Includes screwdriver and plastic tool for a hassle-free swap in under 10 minutes.
- • **Safety First, Always:** Advanced protection circuit guards against overcharge, discharge, and short circuits.
- • **Seamless Compatibility:** Perfect fit for Harman Kardon Onyx Studio 1-4 models, restoring your speaker’s portability.
- • **Power That Lasts Longer:** 3500mAh capacity outperforms the original for extended playtime.
- • **Engineered for Durability:** Foam cushioning and reinforced wiring protect your battery connection.

## Overview

The Rapthor 3500mAh rechargeable replacement battery is designed specifically for Harman Kardon Onyx Studio 1 through 4 wireless Bluetooth speakers. It offers a higher capacity than the original battery, ensuring longer playback time. The package includes all necessary tools for a quick and easy installation, enhanced with protective foam and durable wiring for reliable performance. Built-in safety circuits protect against common battery risks, making it a safe and seamless upgrade to restore your speaker’s portability and power.

## Description

Rapthor 3500mAh 3.7V High Power Rechargeable Replacement Battery for Harman/Kardon Onyx Studio, Onyx Studio 2, Onyx Studio 3, Onyx Studio 4 Wireless Bluetooth Speaker Compatibility Rapthor replacement battery is compatible with Harman Kardon Onyx Studio, Onyx Studio 2, Onyx Studio 3, Onyx Studio 4. Higher Capacity 3500mAh high power replacement battery extend longer-lasting working time to your bluetooth speaker. Easy to Install Quick install within 10 minutes with included screwdriver and plastic tool. It’s quite simple. Considerate Details Foam strip for cushion absorbing, super long (longer than original’s) and durable 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. Customer Service 30-day money back and 12-month warranty Specifications Battery Type: Li-ion Product Type: Replacement Battery Capacity: 3500mAh Voltage: 3.7V / 12.95Wh Package Included 1 x Rapthor Replacement Battery 1 x Screwdriver 1 x Plastic Install Tool 1 x User Manual

Review: Perfect fit. My speaker is working again without the power cord. Watch YouTube videos for instructions on how to install.
Review: 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 |
| Best Sellers Rank | #55,012 in Electronics ( See Top 100 in Electronics ) #1,247 in Portable Bluetooth Speakers |
| Manufacturer | MSW (Shenzhen) Technology Limited |
| Product Dimensions | 17.02 x 9.02 x 2.92 cm; 109 g |

## Product Details

- **Brand:** rapthor
- **Colour:** 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 features:** Rechargeable
- **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)

## 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

### ⭐⭐⭐⭐⭐ Review
*by H***O on 13 August 2025*

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

### ⭐⭐⭐⭐⭐ Review
*by M***B on 13 February 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.

### ⭐⭐⭐⭐⭐ Review
*by Q***E on 9 March 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

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-03-21*