---
product_id: 527954538
title: "3500mAh Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker HK-OS4"
brand: "uwayor"
price: "18609 Ft"
currency: HUF
in_stock: true
reviews_count: 13
category: "Uwayor"
url: https://www.desertcart.hu/products/527954538-3500mah-battery-for-harman-kardon-onyx-studio-1-2-3
store_origin: HU
region: Hungary
---

# 3.7V fast recharge 3500mAh high capacity Built-in protection microchips 3500mAh Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker HK-OS4

**Brand:** uwayor
**Price:** 18609 Ft
**Availability:** ✅ In Stock

## Summary

> 🔋 Upgrade your beat, not your wait!

## Quick Answers

- **What is this?** 3500mAh Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker HK-OS4 by uwayor
- **How much does it cost?** 18609 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/527954538-3500mah-battery-for-harman-kardon-onyx-studio-1-2-3)

## Best For

- uwayor enthusiasts

## Why This Product

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

## Key Features

- • **Smart Safety Tech:** Integrated microchips guard against overcharging, overheating, and short circuits—protect your speaker and your investment.
- • **Quick & Easy Upgrade:** Comes with quality tools and straightforward installation—upgrade your sound experience in under 10 minutes.
- • **Eco-Friendly Recharge:** No memory effect means longer battery lifespan and fewer replacements—save money while saving the planet.
- • **Power Through Your Day:** 3500mAh capacity delivers up to 7.5 hours of uninterrupted playtime—outlast the original battery and keep the vibe alive.
- • **Seamless Compatibility:** Specifically engineered for Harman Kardon Onyx Studio 1/2/3/4 models—plug & play replacement with zero hassle.

## Overview

The Uwayor 3500mAh replacement battery is a premium, high-capacity rechargeable battery designed exclusively for Harman Kardon Onyx Studio 1/2/3/4 wireless speakers. Featuring 3.7V voltage, advanced safety microchips, and no memory effect, it extends playtime beyond the original battery while ensuring safe, efficient charging. Easy to install and eco-conscious, it’s the smart upgrade for audiophiles seeking longer-lasting wireless sound.

## Description

Shop Uwayor 3500mAh Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker HK-OS4. Free delivery and returns on eligible orders.

Review: Works - Works very well
Review: Perfect replacement upgrade - This battery wasn't supplied with instructions but found a video on YouTube that showed every thing you need. Came with good quality tools for the price. Replaced in 10 minutes and I actually get more play time than the original, 7.5 hours compared to 5. I did cut the plastic grommet off the old battery leads and glued it on the new leads before installing. Well worth the money.

## Features

- 【Compatible】Replacement battery compatible for Harman, Kardon Onyx Studio 1/2/ 3/ 4 Wireless Bluetooth Speaker. Each battery cell is tested. so check your old battery model first to make sure this is the correct replacement battery.
- 【Battery Model】Voltage: 3.7V, Capacity: 3500mAh;Rechargeable and no memory effect. Environmental protection Rechargeable and no memory effect, use rechargeable battery can save money.
- 【User Tips】Fits directly into the battery slot, The battery capacity of our product is 3500mAh. High capacity can last longer than the original battery, which brings you sufficient playing time for entertainment.
- 【High Quality】Made of premium class A battery cells, long-lasting and durable. High-speed, high-efficiency charging and built-in special microchips to protect your speakers from overcharging, overheating and short circuit.which will help extend battery life.
- 【Satisfactory Service】Our replacement battery is a good choice. We offer a 30-day after services. If you have any questions or problems, please do not hesitate to contact us.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BML7WGBW |
| Guaranteed software updates until | unknown |
| Manufacturer | Uwayor |
| Package Dimensions | 13.7 x 10.2 x 2.9 cm; 90 g |

## Product Details

- **Battery capacity:** 3500 Milliampere Hour (mAh)
- **Battery cell composition:** Lithium Ion
- **Brand:** Uwayor
- **Number of batteries:** 1 Lithium Polymer batteries required. (included)
- **Recommended uses for product:** MP3 Player

## Images

![3500mAh Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker HK-OS4 - Image 1](https://m.media-amazon.com/images/I/61oXzF4pCML.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works
*by A***E on 19 December 2025*

Works very well

### ⭐⭐⭐⭐⭐ Perfect replacement upgrade
*by B***A on 7 November 2024*

This battery wasn't supplied with instructions but found a video on YouTube that showed every thing you need. Came with good quality tools for the price. Replaced in 10 minutes and I actually get more play time than the original, 7.5 hours compared to 5. I did cut the plastic grommet off the old battery leads and glued it on the new leads before installing. Well worth the money.

### ⭐⭐⭐⭐⭐ Simple enough
*by M***S on 31 December 2024*

Installed in a momenta an Harman Kardon revitalised. Perfect

## Frequently Bought Together

- Uwayor 3500mAh Battery for Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker HK-OS4
- Spurtar Universal Oil Filter Wrench 3 Jaw Adjustable Oil Filter Removal Tool 2 Way for 64mm - 116mm 2-1/2'' to 4-9/16''
- Liqui Moly Oil Change Canister, Pack of 1, Oil Change Accessories, Item No.: 7055, Practical Oil Change Canister, Accessories for Oil Change

---

## 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.hu/products/527954538-3500mah-battery-for-harman-kardon-onyx-studio-1-2-3](https://www.desertcart.hu/products/527954538-3500mah-battery-for-harman-kardon-onyx-studio-1-2-3)

---

*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-01-23*