NYI upgraded 3500mAh battery for Harman Kardon Onyx Studio enhances playtime
Onyx Studio battery slot closeup showing snug fit and clean contacts
Compatible NYI battery pack ready to install in Onyx Studio speakers
Tools and adhesive tapes included for NYI battery installation
PTC safety protections on the NYI battery for safer operation
Packaging shows 1 battery, 2 tools, and 2 tapes for easy swap

NYI

NYI Upgraded 3500mAh Replacement Battery for Harman Kardon Onyx Studio 1-4

Free U.S. shipping and free 30-day returns. Check the compatible models in the description below.

$23.54

In stock. Ships free, usually within 1–4 business days.

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Check the listed compatible models and specs before you order. Questions? Email us.

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Free tracked shipping on every order. Most orders arrive within 3–8 business days.

Free 30-day returns

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Return eligible items within 30 days of delivery for a full refund. We email you a prepaid return label.

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During high demand, deliveries may experience short carrier delays. Tracking updates remain active for every order.

Email support

Questions about fit or an order? Email nexoltic@gmail.com. We reply on business days (Mon–Fri).

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Product details

Overview

Enhance your Harman Kardon Onyx Studio experience with the NYI Upgraded 3500mAh replacement battery. This high-capacity module is designed to restore longer listening sessions and provide a steady power source for your speaker, while keeping the device’s clean, familiar form.

Engineered for Onyx Studio models 1 through 4, the battery delivers 3500mAh at 3.7V (12.95Wh). That boost in capacity can translate to more playback time between charges, helping you enjoy your music, podcasts, or playlists without frequent recharging.

Technical notes

Key specs include a practical 3.7V rating and a robust energy figure of 12.95Wh. While real-world results depend on usage, the higher capacity is designed to support longer sessions before a recharge is needed.

Safety and reliability

The NYI battery integrates built-in PTC protections that monitor pressure, temperature, and current. These safeguards contribute to stable operation and can help protect both the battery and your speaker during use.

What’s included

  • 1 replacement battery
  • 2 installation tools
  • 2 adhesive tapes

Warranty and support

Enjoy a 12-month warranty and 24-hour email support. If you have questions about fitment or setup, NYI is ready to help. Your satisfaction matters, and feedback is welcome.

Why you might consider this upgrade

For everyday listening, outdoor gatherings, or home entertainment setups, a higher-capacity battery can offer more flexibility between charges. This replacement is designed to fit the Onyx Studio family and comes with practical installation tools, making it a convenient option to refresh your speaker’s power source.

FAQ

Q: Is this NYI battery compatible with Harman Kardon Onyx Studio models 1–4?

A: Yes, designed to fit Harman Kardon Onyx Studio 1–4 models.

Q: What is included in the package?

A: The package includes 1 replacement battery, 2 installation tools, and 2 adhesive tapes.

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