--- product_id: 65969722 title: "MINCHEN 8.4V Battery Pack Case for 2/4x 18650 li-ion Battery Waterproof Safety Cycling Battery Pack Case Box Cover with DC and USB Interface for Bike Light Headlamp Cell Phone, no Battery Included" brand: "minchen" price: "NT$37" currency: TWD in_stock: false url: https://www.desertcart.tw/products/65969722-minchen-8-4v-battery-pack-case-for-2-4x-18650 store_origin: TW region: Taiwan --- # Waterproof ABS case for all-weather rides 8.4V output for powerful bike lights Dual DC & USB ports for versatile charging MINCHEN 8.4V Battery Pack Case for 2/4x 18650 li-ion Battery Waterproof Safety Cycling Battery Pack Case Box Cover with DC and USB Interface for Bike Light Headlamp Cell Phone, no Battery Included **Brand:** minchen **Price:** NT$37 **Availability:** ❌ Out of Stock ## Summary > ⚡ Stay powered, stay unstoppable — wherever the trail takes you! ## Quick Answers - **What is this?** MINCHEN 8.4V Battery Pack Case for 2/4x 18650 li-ion Battery Waterproof Safety Cycling Battery Pack Case Box Cover with DC and USB Interface for Bike Light Headlamp Cell Phone, no Battery Included by minchen - **How much does it cost?** NT$37 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/65969722-minchen-8-4v-battery-pack-case-for-2-4x-18650) ## Best For - minchen enthusiasts ## Why This Product - Trusted minchen brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Charge On The Go:** Dual DC and USB interfaces let you power bike lights or emergency charge your phone. - • **Ride Rain or Shine:** Durable, lightweight waterproof ABS case keeps your batteries safe in any weather. - • **Safety First, Always:** Built-in overcharge and over-discharge protection ensures long-lasting battery health. - • **Smart Battery Status:** 3-level blue LED indicators keep you informed on power levels to avoid surprises. - • **Power Your Ride, Your Way:** Supports 2 or 4 x 18650 batteries for customizable capacity and runtime. ## Overview The MINCHEN 8.4V Battery Pack Case is a rugged, waterproof housing designed for 2 or 4 x 18650 rechargeable Li-ion batteries (not included). Featuring dual DC and USB output ports, it powers 8.4V or 4.2V bike lights and can emergency charge phones. With smart LED power indicators and built-in overcharge/discharge protection, it’s the perfect DIY power solution for serious cyclists who demand reliability and versatility in all conditions. ## Description Water proof Case for DIY 18650 batteries pack power bank for bike light head lamp, Support 2 or 4 x18650 batteries in one pack. -Rechargeable Cycling Safety Waterproof Battery Pack Case House Cover with DC and USB interface for Bike light - Size: 45x47x88mm - Cable Length: 57cm -Strap: 41.5x3.8cm - Material: High quality ABS Plastic, lightweight ,durable and Waterproof ; - Easy to use, only need to load 2 or 4x 18650 batteries into the case; - With DC interface, Output and input voltage is 8.4V, suitable for 8.4V Bike light; USB interface suitable for 4.2V Bike light; use the case you can choose any capacity 18650 batteries packed as power bank for you Cycling Bike light or charge mobile phone in emergency; - Product parameters - 1) Over-charge protection voltage:8.4 V; - 2) Over-discharge protection voltage: 5 V; - 3) Over-discharge protection current: 9 A; - 4) Standby current: 10 uA; - 5) USB output standard voltage: 5 V±0.2; - 6) USB max output: 2000MA - Package includes:- 1 x Battery Case for 4 pcs 18650 batteries( no batteries included) - Strap. - The Case is for DIY batteries pack to supply power for Cycling Bike light. We suggest you use protected 18650 Rechargeable batteries for the case, it’s better to charge your 18650 batteries to full before use; Please always recharge your batteries when there is only One Blue indicator light on and flash if you use unprotected 18650 batteries.- Please avoid using your device while charging. ## Features - Brand: SolarStorm, The Rechargeable Waterproof Case for 4x 18650 batteries is special designed for Cycling Bike light Headlight, with DC and USB interface; DC interface is for connecting 8.4V Bike light, USB interface suitable for connecting 4.2v Bike light head lamp, or charge cell phone in emergency - Required 4pcs 18650 3.7v Rechargeable Li-ion battery - Great for DIY 18650 Batteries Pack for bike light headlights or outdoor sports charge phone, support 2pcs or 4pcs 18650 batteries into the case, use this case you can choose any capacity of 18650 batteries for your bikelight lamp to supply power, easy and convenient - [Power Status Indicators Showing] 3x Blue Indicator showing you batteries power status:Three lights lit on(power≥80%). - Two lights lit on(50%≤power≤80%). - One light lit on and flash(runtime≤30minutes, need change batteries or charge batteries). - Over-Charge Protection Voltage:8.4V, Over-Discharge Protection Voltage:5V ## Technical Specifications | Specification | Value | |---------------|-------| | Item Package Dimensions L x W x H | 4.5 x 3 x 3 inches | | Package Weight | 0.14 Kilograms | | Brand Name | MINCHEN | | Country of Origin | China | | Color | Black for 4 | | Material | ABS, Plastic | | Manufacturer | MINCHEN | | Part Number | 8.4V battery case for 4x 18650 | ## Images ![MINCHEN 8.4V Battery Pack Case for 2/4x 18650 li-ion Battery Waterproof Safety Cycling Battery Pack Case Box Cover with DC and USB Interface for Bike Light Headlamp Cell Phone, no Battery Included - Image 1](https://m.media-amazon.com/images/I/61Lre5zRrFL.jpg) ![MINCHEN 8.4V Battery Pack Case for 2/4x 18650 li-ion Battery Waterproof Safety Cycling Battery Pack Case Box Cover with DC and USB Interface for Bike Light Headlamp Cell Phone, no Battery Included - Image 2](https://m.media-amazon.com/images/I/61gtbUJJ-CL.jpg) ![MINCHEN 8.4V Battery Pack Case for 2/4x 18650 li-ion Battery Waterproof Safety Cycling Battery Pack Case Box Cover with DC and USB Interface for Bike Light Headlamp Cell Phone, no Battery Included - Image 3](https://m.media-amazon.com/images/I/61kwv28p15L.jpg) ![MINCHEN 8.4V Battery Pack Case for 2/4x 18650 li-ion Battery Waterproof Safety Cycling Battery Pack Case Box Cover with DC and USB Interface for Bike Light Headlamp Cell Phone, no Battery Included - Image 4](https://m.media-amazon.com/images/I/61H-PcAzEtL.jpg) ![MINCHEN 8.4V Battery Pack Case for 2/4x 18650 li-ion Battery Waterproof Safety Cycling Battery Pack Case Box Cover with DC and USB Interface for Bike Light Headlamp Cell Phone, no Battery Included - Image 5](https://m.media-amazon.com/images/I/712n+IY6nKL.jpg) ## Questions & Answers **Q: For the 5v usb, does it use a buck converter (switching) or linear step-down converter to get voltage down from 7.4v to 5v?** A: Drive internal depressurization, USB terminal does not need external epuipment to get voltage down,can use USB Cable to charge phone directly. **Q: Are all button type 18650 protected?** A: Protected? Not sure what you are asking. I use this for road bike lights. Unit is waterproof and controlled with positive discharge / use vis a button. **Q: Can I use just 2 batteries? Will it still work?** A: It's better to use at lease 4PC 18650 full charged batteries. **Q: Does this provide continous power to 5v usb without turning off without the device drawing power like a power supply?** A: Yes it does. I power my night bike lights and charge my phone at the same time. Love it. --- ## 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.tw/products/65969722-minchen-8-4v-battery-pack-case-for-2-4x-18650](https://www.desertcart.tw/products/65969722-minchen-8-4v-battery-pack-case-for-2-4x-18650) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-04-23*