--- product_id: 485867384 title: "3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker" brand: "rapthor" price: "฿5085" currency: THB in_stock: true reviews_count: 5 category: "Rapthor" url: https://www.desertcart.co.th/products/485867384-3500mah-rechargeable-replacement-battery-compatible-with-harman-kardon-onyx-studio store_origin: TH region: Thailand --- # 3500mAh High Capacity Easy Quick Install Kit Built-in Safety Circuit 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker **Brand:** rapthor **Price:** ฿5085 **Availability:** ✅ In Stock ## Summary > 🔋 Upgrade your sound, not your wait time! ## Quick Answers - **What is this?** 3500mAh Rechargeable Replacement Battery Compatible with Harman Kardon Onyx Studio 1/2/3/4 Wireless Bluetooth Speaker by rapthor - **How much does it cost?** ฿5085 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/485867384-3500mah-rechargeable-replacement-battery-compatible-with-harman-kardon-onyx-studio) ## 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 and plastic tool for a hassle-free 10-minute setup. - • **Safety First, Always:** Advanced protection circuit guards against overcharge, discharge, and short-circuits. - • **Seamless Compatibility:** Perfectly fits Harman Kardon Onyx Studio 1-4 models for flawless performance. - • **Power That Lasts Longer:** 3500mAh capacity outperforms the original for extended playtime. - • **Engineered for Durability:** Foam cushioning and reinforced wiring protect your battery 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 battery, it delivers longer-lasting performance. The package includes all necessary tools for a quick and easy installation, enhanced with protective foam and durable wiring for reliability. Built-in safety circuits ensure secure operation against overcharge, over-discharge, and short circuits, making it a safe and seamless upgrade to keep your speaker powered and ready. ## 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 Review: Perfect for for my speaker Review: Onyx 4 Replacement ## 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 | |---------------|-------| | ASIN | B099NJVQQ7 | | Additional Features | Easy to Install, Higher Capacity, Short Circuit Protection | | Box Contents | Install tool, Replacement battery, Screwdriver | | Brand | rapthor | | Brand Name | rapthor | | Colour | Black | | Compatible Devices | Cordless Tools | | Compatible Phone Models | Onyx Studio | | Connectivity Technology | Bluetooth | | Connector Type | wireless | | Customer Package Type | Standard Packaging | | Customer Reviews | 4.5 out of 5 stars 309 Reviews | | Enclosure Material | Lithium-ion | | Included Components | Install tool, Replacement battery, Screwdriver | | Input Voltage | 3.7 Volts | | Item Type Name | battery | | Item Weight Unit of Measure | 0.11 Kilograms | | Manufacturer | china | | Number of Items | 1 | | Number of Power Levels | 1 | | Output Voltage | 3.7 Volts | | Portable | Yes | | Power Plug Type | No Plug | | Power Source | Battery Powered | | Special Feature | Easy to Install, Higher Capacity, Short Circuit Protection | | Specification Met | Li-ion Battery Standard, Higher Capacity, Easy to Install, Safe Performance | | UPC | 735818080479 | | Unit Count | 1.0 Count | | Wattage | 12.95 Watts | ## 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 ![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) ## 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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect for for my speaker *by H***O on 13 August 2025* ### ⭐⭐⭐⭐⭐ Onyx 4 Replacement *by M***B on 13 February 2024* ### ⭐⭐⭐⭐⭐ Good replacement for the original battery! *by Q***E on 9 March 2024* ## 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.co.th/products/485867384-3500mah-rechargeable-replacement-battery-compatible-with-harman-kardon-onyx-studio](https://www.desertcart.co.th/products/485867384-3500mah-rechargeable-replacement-battery-compatible-with-harman-kardon-onyx-studio) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-30*