18650 Portable Power Bank Case – Build Your Own External Battery

Create a flexible backup power solution with this 18650 portable power bank case. Designed for DIY users and everyday charging needs, it allows you to insert your own rechargeable 18650 lithium batteries (not included) to build a reliable external battery for smartphones and USB-powered devices.

Quick Picks: olevo Magnetic Wireless Power Bank | MagSafe Fast Charger · VIVO Magnetic Wireless Power Bank | Fast Travel Charger

18650 external battery power bank case with dual USB output and metal shell

Compact, durable, and easy to use, it’s ideal for travel, emergency kits, or daily carry.

⚠️ This product is a power bank case/charger only. Batteries are NOT included.

⚡ Key Features

• DIY 18650 Power Bank Case – Customize capacity using your own batteries

• Dual USB Output – Charge two devices simultaneously

• Wide Compatibility – Works with mobile phones and USB electronic devices

• Built-In Safety Chip – Protects against short circuit, overload, and overheating

• Rechargeable Design – Supports batteries with over 500 charge cycles

• Portable & Lightweight – Easy to carry with included keychain

• Durable Shell – Designed for everyday use and protection

🔋 Performance & Compatibility

• Battery Type Supported: 18650 Li-Polymer / Lithium batteries (flat head recommended)

• Input Interface: Micro USB

• Output Interface: Dual USB

• Compatible Devices: Smartphones, mobile accessories, USB-powered electronics

📐 Design & Build

• Shell Material: Metal shell (with plastic internal structure)

• Color: White

• Form Factor: Compact, pocket-friendly design

• Extras: Includes keychain for easy carrying

📦 Package Contents

• 1 × 18650 External Battery Power Bank Case (Battery Not Included)

• 1 × Keychain

Note: Due to lighting and display differences, actual color may vary slightly. Manual measurements may allow a ±1–3 cm difference.

👍 Pros & Cons

Pros: Customizable capacity, dual USB output, safety protection, portable design
Cons: Batteries not included; requires user-installed 18650 cells

🌍 Why Choose This 18650 Power Bank Case?

Compared to pre-built power banks, this 18650 external battery charger case gives you flexibility, cost efficiency, and easy battery replacement, making it a smart option for DIY users and backup power needs.

🛒 Add to cart now — limited availability!
Build your own portable power solution today.

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The 18650 Power Bank Case is a DIY 18650 power bank case with dual USB output, letting you build a custom portable charger using your own lithium cells.