12×21700 DIY Power Bank Case – 22.5W Fast & 15W Wireless Charging
12×21700 DIY Power Bank Case – 22.5W Fast & 15W Wireless Charging
Build Your Own High-Capacity Power Bank
Take full control of your portable charging setup with this 12×21700 DIY Power Bank Shell. Designed for makers, tech enthusiasts, and anyone who wants a customizable charging solution, this case supports up to 12 standard 21700 cells (not included) and delivers impressive wired and wireless charging speeds — all in a sturdy plastic-and-metal housing.
Whether you're topping up a smartphone fast or charging a device wirelessly overnight, this box has you covered with multiple output modes and a built-in LED indicator so you always know your charge status at a glance.
Key Features
- Fits 12 × 21700 Cells — High-capacity DIY configuration for extended use (batteries sold separately)
- 22.5W Wired Fast Charging — Rapid charge compatible devices via the dual USB / USB-C ports
- 10W & 15W Wireless Charging — Built-in Qi wireless charging pad for cord-free convenience
- Dual USB + USB-C Output — Charge two or more devices simultaneously
- LED Charge Indicator — Instantly see remaining battery level without guessing
- Durable Plastic + Metal Construction — Lightweight yet resilient housing that protects your cells
- Available in Black & White — Clean, minimal aesthetic to suit any style
Specifications
| Cell Compatibility | 12 × 21700 (batteries not included) |
| Max Output Power | ≤37.5W |
| Wired Fast Charging | 10W / 22.5W |
| Wireless Charging | 15W (Qi) |
| Ports | Dual USB-A + USB-C |
| Material | Plastic + Metal |
| Dimensions | 164 × 85 × 52 mm (6.45 × 3.34 × 2.04 in) |
| Colors | Black / White |
| Country of Origin | Made in China |
What's in the Box
- 1 × 12-Cell 21700 DIY Power Bank Case
Note: 21700 batteries are NOT included. Please allow ±5–10 mm for manual measurements. Colors may vary slightly due to monitor settings.
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Learn more: ENERGY STAR product efficiency guidance
Frequently Asked Questions
Q: What size batteries does this DIY power bank case support?
A: This case is designed specifically for 21700 lithium cells and holds up to 12 of them. 21700 batteries are NOT included and must be purchased separately. Make sure to use quality 21700 cells for best performance and safety.
Q: What charging speeds does this case support?
A: The case supports 10W and 22.5W wired fast charging via its Dual USB and USB-C ports, and 15W Qi wireless charging for compatible devices. Maximum combined output power is ≤37.5W.
Q: Can I charge multiple devices at the same time?
A: Yes! The dual USB-A and USB-C output ports allow you to charge more than one device simultaneously, making it ideal for topping up a phone and earbuds or tablet at the same time.
Q: Does the LED indicator show how much charge is left?
A: Absolutely. The built-in LED indicator lights up to display the current battery level, so you can monitor your stored charge at any time without needing an app or display screen.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.