---
product_id: 485867384
title: "Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker"
brand: "rapthor"
price: "€ 2.64"
currency: EUR
in_stock: true
url: https://www.desertcart.nl/products/485867384-rapthor-3500mah-rechargeable-replacement-battery-compatible-with-harman-kardon-onyx
store_origin: NL
region: Netherlands
---

# 3500mAh High Capacity Easy 10-min 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:** € 2.64
**Availability:** ✅ In Stock

## Summary

> 🔋 Upgrade your vibe—power up your Onyx Studio with unstoppable energy!

## 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?** € 2.64 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/485867384-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 & plastic tool for a hassle-free replacement in under 10 minutes.
- • **Power That Outlasts:** 3500mAh capacity delivers extended playtime beyond the original battery—never miss a beat.
- • **Safety First, Always:** Advanced protection circuit guards against overcharge, over-discharge, and short circuits.
- • **Seamless Compatibility:** Perfectly fits Harman Kardon Onyx Studio 1-4 models to revive your wireless speaker’s power.
- • **Engineered for Durability:** Foam cushioning and longer, reinforced wiring ensure a secure, damage-resistant connection.

## Overview

The Rapthor 3500mAh rechargeable replacement battery is designed specifically for Harman Kardon Onyx Studio 1 through 4 wireless Bluetooth speakers. Featuring a higher capacity than the original, it extends playback time significantly. The package includes all necessary tools for a quick, easy installation, while built-in safety circuits protect against electrical faults. Enhanced wiring and cushioning materials ensure durability and reliable performance, making it the ultimate power upgrade for your premium speaker.

## 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

## 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 |
|---------------|-------|
| Brand | rapthor |
| Manufacturer | china |
| Product Dimensions | 17.02 x 9.02 x 2.92 cm; 109 g |
| Batteries | 1 Lithium Ion batteries required. (included) |
| Hardware Platform | android |
| Compatible Devices | Cordless Tools |
| Special Features | Easy to Install, Higher Capacity, Short Circuit Protection |
| Mounting Hardware | Install tool, Replacement battery, Screwdriver |
| Number of items | 1 |
| Voltage | 3.7 Volts |
| Wattage | 12.95 Watts |
| Power Source | Battery Powered |
| Battery Description | lithium-ion |
| Batteries Included | Yes |
| Batteries Required | Yes |
| Battery Capacity | 3500 Milliamp Hours |
| Battery cell composition | Lithium Ion |
| Battery Power Rating | 3500 Milliamp Hours |
| Connector Type | Bluetooth |
| Material | Lithium-ion |
| Includes Rechargeable Battery | Yes |
| Manufacturer | china |
| Item Weight | 109 g |

## Product Details

- **Brand:** rapthor
- **Connector Type:** wireless
- **Compatible Devices:** Cordless Tools
- **Compatible Phone Models:** Onyx Studio
- **Included Components:** Install tool, Replacement battery, Screwdriver
- **Special Feature:** Easy to Install, Higher Capacity, Short Circuit Protection
- **Colour:** Black
- **Input Voltage:** 3.7 Volts
- **Wattage:** 12.95 Watts
- **Number of Items:** 1

## 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

## Frequently Bought Together

- Rapthor 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker
- for Harman Kardon Charger Onyx Studio 8 7 6 5 4 3 2 1 Wireless Bluetooth Speaker Replacement Harmon Kardon Charger 19V AC Power Cord Supply【10 FT】 VHBW
- Charger for Harman Kardon Onyx Studio 8 7 6 5 4 3 2 1 Wireless Bluetooth Portable Speaker Compatible with Harman Kardon Charger 19V 38W AC Charger Fast Replacement Power Adapter

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.nl/products/485867384-rapthor-3500mah-rechargeable-replacement-battery-compatible-with-harman-kardon-onyx](https://www.desertcart.nl/products/485867384-rapthor-3500mah-rechargeable-replacement-battery-compatible-with-harman-kardon-onyx)

---

*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-21*