---
product_id: 383069426
title: "NYI [Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Speaker"
brand: "nyi"
price: "155 Lei"
currency: RON
in_stock: true
reviews_count: 8
category: "Nyi"
url: https://www.desertcart.ro/products/383069426-nyi-upgraded-3500mah-replacement-battery-for-harman-kardon-onyx-studio
store_origin: RO
region: Romania
---

# 3.7V Stable Voltage 3500mAh High Capacity Built-in Safety Protections NYI [Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Speaker

**Brand:** nyi
**Price:** 155 Lei
**Availability:** ✅ In Stock

## Summary

> 🔋 Recharge your vibe, keep the party alive!

## Quick Answers

- **What is this?** NYI [Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Speaker by nyi
- **How much does it cost?** 155 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/383069426-nyi-upgraded-3500mah-replacement-battery-for-harman-kardon-onyx-studio)

## Best For

- nyi enthusiasts

## Why This Product

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

## Key Features

- • **DIY Friendly Kit:** Includes tools and adhesive tapes—get your speaker back to life in under 10 minutes, no tech expert needed.
- • **Power Up Your Sound:** Upgraded 3500mAh battery delivers extended playtime—never miss a beat during your work or unwind sessions.
- • **Safety First, Always:** Integrated PTC protections guard against pressure, temperature, and current fluctuations for reliable performance.
- • **Seamless Compatibility:** Perfectly fits Harman Kardon Onyx Studio 1-4 models for a hassle-free upgrade experience.
- • **Confidence in Every Charge:** Backed by a 12-month warranty and 24/7 email support, ensuring your investment is worry-free.

## Overview

The NYI Upgraded 3500mAh Replacement Battery is a high-capacity, lithium-ion power source designed specifically for Harman Kardon Onyx Studio 1 through 4 speakers. Featuring stable 3.7V output and built-in safety protections, it ensures long-lasting, safe performance. The package includes essential tools and adhesive for easy installation, supported by a 12-month warranty and responsive customer service.

## Description

desertcart.com: NYI [Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Speaker : Electronics

Review: Great replacement - Easy replacement for the original battery. Got my speaker back up and working. Would recommend this to everybody.
Review: Easy to replace, great battery life. - Works great! My two Onyx 3 speakers were down to 30 minutes playtime. It took less than 10 minutes with each speaker to put in the new batteries. The screws on the Onyx 3 are standard Phillips. I’ve only tested one so far because after 5 hours it was still playing strong, I believe the second speaker will be just was strong. With the Onyx 3 the battery case screws are slightly shorter than the speaker case screws, just keep them separate.

## Features

- Compatible with : NYI Harman Kardon Replacement Battery compatible with Harman Kardon Onyx Studio, Harman Kardon Onyx Studio-1,Harman Kardon Studio-2, Harman Kardon Studio-3, Harman Kardon Studio-4, li11b001f Speaker.
- High Capacity : 3500mAh Large Capacity Li-ion replacement battery; Battery voltage: 3.7V / 12.95Wh.
- High Quality & Safety : NYI Harman Kardon Onyx Studio battery built-in PTC protections (pressure, temperature, current),make sure the battery run stably and perfectly.
- Package Includes : 1 pc harman kardon replacement battery, 2 pcs tools, 2 pcs adhesive tapes.
- After-sales Service : 12 months warranty.24 hours email support. Your satisfaction is important to us, please contact us with any question.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09C25691F |
| Antenna Location | Speaker |
| Battery Capacity | 3500 Milliamp Hours |
| Battery Cell Composition | Lithium Ion |
| Battery Cell Type | Lithium Ion |
| Battery Weight | 140 Grams |
| Best Sellers Rank | #112,432 in Electronics ( See Top 100 in Electronics ) #2,326 in Portable Bluetooth Speakers |
| Brand | NYI |
| Compatible Phone Models | Harman Kardon Onyx Studio, Harman Kardon Onyx Studio 2, Harman Kardon Onyx Studio 3, Harman Kardon Onyx Studio 4 |
| Customer Reviews | 4.6 out of 5 stars 204 Reviews |
| Item Weight | 0.11 Kilograms |
| Manufacturer | MSW (Shenzhen) Technology Limited |
| Model Name | Battery |
| Number of Batteries | 1 Lithium Ion batteries required. |
| Recommended Uses For Product | Speaker |
| Reusability | Rechargeable |
| UPC | 735818081773 |
| Unit Count | 1.0 Count |
| Voltage | 3.7 Volts |
| Warranty Description | 1 year warranty |

## Product Details

- **Battery Capacity:** 3500 Milliamp Hours
- **Battery Cell Composition:** Lithium Ion
- **Brand:** NYI
- **Number of Batteries:** 1 Lithium Ion batteries required.
- **Recommended Uses For Product:** Speaker

## Images

![NYI [Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Speaker - Image 1](https://m.media-amazon.com/images/I/7148tIm5C0L.jpg)

## Questions & Answers

**Q: It says that I can't have this delivered to my address,  is it possible to have it delivered to a store like Oreilly's.**
A: Hello, if the logistics cannot deliver the NYI Harman Kardon Onyx Studio Battery Replacement to your address, you can try to change the address to an address that FBA can deliver. The specific operations are as follows:
1. You can open the purchase page of "[Upgraded 3500mAh] NYI Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Wireless Bluetooth Speaker" on the computer, and click "pickup" in the upper right corner to select the shipping address that suits you.
Please note: This operation has a certain risk of losing goods, please use it with caution.
2. You can choose the address that Amazon can deliver to (such as your friend's house).

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great replacement
*by P***H on October 13, 2025*

Easy replacement for the original battery. Got my speaker back up and working. Would recommend this to everybody.

### ⭐⭐⭐⭐⭐ Easy to replace, great battery life.
*by T***X on March 24, 2025*

Works great! My two Onyx 3 speakers were down to 30 minutes playtime. It took less than 10 minutes with each speaker to put in the new batteries. The screws on the Onyx 3 are standard Phillips. I’ve only tested one so far because after 5 hours it was still playing strong, I believe the second speaker will be just was strong. With the Onyx 3 the battery case screws are slightly shorter than the speaker case screws, just keep them separate.

### ⭐⭐⭐⭐⭐ Work great quality
*by K***N on February 22, 2026*

Excellent work as expected

## Frequently Bought Together

- NYI [Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Speaker
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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-03-02*