---
product_id: 94826253
title: "3500mAh Rechargeable Replacement Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker, Real Capacity, Same Quality as Original Battery"
brand: "kratax"
price: "KD 8.67"
currency: KWD
in_stock: true
url: https://www.desertcart.com.kw/products/94826253-3500mah-rechargeable-replacement-battery-for-harman-kardon-onyx-studio-1
store_origin: KW
region: Kuwait
---

# 3.7V voltage 3500mAh capacity Easy installation tools 3500mAh Rechargeable Replacement Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker, Real Capacity, Same Quality as Original Battery

**Brand:** kratax
**Price:** KD 8.67
**Availability:** ✅ In Stock

## Summary

> 🔊 Power Up Your Sound Experience!

## Quick Answers

- **What is this?** 3500mAh Rechargeable Replacement Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker, Real Capacity, Same Quality as Original Battery by kratax
- **How much does it cost?** KD 8.67 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/94826253-3500mah-rechargeable-replacement-battery-for-harman-kardon-onyx-studio-1)

## Best For

- kratax enthusiasts

## Why This Product

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

## Key Features

- • **🔒 Safety First:** Built-in protection circuits for worry-free use.
- • **🔋 Unleash the Power:** Experience 35% more battery life than the original!
- • **🌍 Eco-Friendly Choice:** Rechargeable and certified for safety.
- • **🎶 Vibration-Free Sound:** Cushioning sponge strip for uninterrupted music.
- • **⚙️ Hassle-Free Replacement:** Includes all tools for a seamless swap.

## Overview

The Kratax 3500mAh Rechargeable Replacement Battery is designed specifically for Harman Kardon Onyx Studio models 1 through 4. With a capacity of 3500mAh, it offers 35% more power than the original battery, ensuring longer playtime. The package includes essential tools for easy installation and features built-in safety circuits to protect against overcharging and short circuits. Certified for quality and safety, this battery is the perfect upgrade for your wireless speaker.

## Description

3500mAh Rechargeable Replacement Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker, Real Capacity, Same Quality as Original Battery

## Features

- High Capacity: 3500mAh Kratax replacement battery has 35% more capacity than the original battery, providing longer lasting performance for your speaker.
- Easy to Use: The package includes the necessary screwdriver and pry bar for battery replacement, which makes it easy to replace the battery. The included cushioning sponge strip is used to wrap the battery to prevent vibration noise when playing music. The sponge of connecting cables can better protect the wiring from damage.
- Hassle-free Purchase: Made with accessories that are equivalent to the original battery and built with the same battery construction for smoother use.
- Applicable models: Compatible with Harman Kardon Onyx Studio, Onyx Studio 2, Onyx Studio 3, Onyx Studio 4 wireless bluetooth speakers.
- Safety Protection: Built-in protection circuits to avoid overcharging, over-discharging, short-circuit protection and charging protection to ensure the safety of the battery and speakers. Passed ISO9001, RoHS and CE international certification.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Reusability | Rechargeable |
| Battery Capacity | 3500 Milliamp Hours |
| Voltage | 3.7 Volts |
| Compatible Phone Models | Harman Kardon Onyx Studio, Onyx Studio 2, Onyx Studio 3, Onyx Studio 4 |
| Item Dimensions | 4 x 4 x 1 inches |
| Item Weight | 87 Grams |
| Battery Weight | 29 Grams |
| Unit Count | 1.0 Count |
| Battery Cell Type | Lithium Ion |

## Product Details

- **Number of Batteries:** 1 Lithium Ion batteries required. (included)
- **Brand:** Kratax
- **Battery Cell Composition:** Lithium Ion
- **Battery Capacity:** 3500 Milliamp Hours
- **Recommended Uses For Product:** Suitable for Harman Kardon Onyx Studio speakers

## Images

![3500mAh Rechargeable Replacement Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker, Real Capacity, Same Quality as Original Battery - Image 1](https://m.media-amazon.com/images/I/71dhN9-JwyL.jpg)

## Questions & Answers

**Q: Has anyone been using this replacement battery for more than a year?  Is it holding up well?  Does it hold a charge well after a year or 2 of use?**
A: Don't worry! Until now, we have never received any complaints from customers about the performance of battery was deteriorated gradually after one year's use.

**Q: Will the charger for the 2600 work with the 3500?**
A: If the batteries are the same style(work for Harman/Kardon Onyx Studio or Onyx Studio 2), the charger can be used for 2600mAh battery or 3500mAh battery. 
Please feel free to contact us if have any future questions, thank you!

**Q: Would this work on a Studio 3?**
A: We have received responses saying that the battery can work on Studio 4. We can assure that it can work on Studio and Studio 2, but Studio 3 we cannot be 100% sure of the compatibility.

**Q: Is this the most powerful, longest lasting best battery available for the hk onyx studio 4 bluetooth speaker please?**
A: Sure, our battery uses the same material and craftsmanship as the original battery. As long as you carefully replace it according to the video on YouTube, you will get a new speaker. If you have any problems after purchase, you can also full refund or replace it at any time.

## Frequently Bought Together

- Kratax 3500mAh Rechargeable Replacement Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker, Real Capacity, Same Quality as Original Battery
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**Shop now:** [https://www.desertcart.com.kw/products/94826253-3500mah-rechargeable-replacement-battery-for-harman-kardon-onyx-studio-1](https://www.desertcart.com.kw/products/94826253-3500mah-rechargeable-replacement-battery-for-harman-kardon-onyx-studio-1)

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-02-07*