--- product_id: 383069426 title: "NYI [Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Speaker" brand: "nyi" price: "S$30" currency: SGD in_stock: true reviews_count: 8 category: "Nyi" url: https://www.desertcart.sg/products/383069426-nyi-upgraded-3500mah-replacement-battery-for-harman-kardon-onyx-studio store_origin: SG region: Singapore --- # 3.7V Stable Voltage 3500mAh High Capacity Built-in PTC Safety NYI [Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Speaker **Brand:** nyi **Price:** S$30 **Availability:** ✅ In Stock ## Summary > 🔋 Upgrade 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?** S$30 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/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 - • **Power Up Your Sound:** 3500mAh battery delivers extended playtime so your Onyx Studio never misses a beat. - • **Safety First, Always:** Integrated PTC protections guard against pressure, temperature, and current spikes for worry-free listening. - • **Seamless Compatibility:** Perfectly engineered for Harman Kardon Onyx Studio 1 through 4 models—plug and play with zero hassle. - • **Quick & Easy Installation:** Includes tools and adhesive tapes—get your speaker back to life in under 10 minutes. - • **Confidence in Every Charge:** Backed by a 12-month warranty and 24/7 email support to keep your music flowing uninterrupted. ## Overview The NYI Upgraded 3500mAh Replacement Battery is a high-capacity, lithium-ion power source designed specifically for Harman Kardon Onyx Studio 1-4 speakers. Featuring a stable 3.7V output and built-in PTC safety protections, it ensures reliable, long-lasting performance. The package includes installation tools and adhesive tapes, supported by a 12-month warranty and responsive customer service, making it the ultimate upgrade for your premium audio experience. ## Description desertcart.com: NYI [Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 Speaker : Electronics 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. Review: Fit and works - Fit and works perfectly ## 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 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 g | | Best Sellers Rank | #27,183 in Electronics ( See Top 100 in Electronics ) #712 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 | 4.5 out of 5 stars 215 Reviews | | Item Weight | 0.11 kg | | 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 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 ### ⭐⭐⭐⭐⭐ 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. ### ⭐⭐⭐⭐⭐ Fit and works *by R***. on August 7, 2026* Fit and works perfectly ### ⭐⭐⭐⭐⭐ 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. ## Frequently Bought Together - NYI [Upgraded 3500mAh] Replacement Battery for Harman Kardon Onyx Studio 1/2/ 3/4 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 Speaker 19V 38W AC Fast 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.sg/products/383069426-nyi-upgraded-3500mah-replacement-battery-for-harman-kardon-onyx-studio](https://www.desertcart.sg/products/383069426-nyi-upgraded-3500mah-replacement-battery-for-harman-kardon-onyx-studio) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-09-08*