DIY 100W PD Power Bank Case for 4×21700 Batteries
Build your own 20,000mAh power bank with this DIY case supporting 4×21700 batteries (not included). Features 100W PD fast charging and a clear LED display for real-time power monitoring.
Customizable High-Capacity Power Bank
This DIY power bank case is designed to house 4 pcs of 21700 polymer batteries (batteries not included), enabling you to build a portable 20,000mAh power source. Its transparent ABS-PVC body provides a clear view of the high-quality internal components and LED display.
Designed for users comfortable with battery assembly and soldering, the case lets you connect batteries in series, making it suitable for charging laptops, phones, and tablets with high power demands.
Supports Advanced Fast Charging Protocols
Equipped with dual Type-C ports and a USB output, this case supports 100W Power Delivery (PD) and several fast-charging protocols including QC, AFC, SCP, enabling versatile charging for many devices.
- Input: DC 5V/3A, 9V/3A, 12V/1.5A, 10V/2.25A
- Output 1 (Type-C): 5V/3A, 9V/3A, 15V/3A, 20V/5A
- Output 2 (Type-C): 5V/3A, 9V/3A, 15V/3A, 20V/3A
- USB output: 5V/3A, 9V/2A, 12V/1.5A, 10V/2.25A
Clear Monitoring and Activation
The imported LED screen displays remaining power in real time, allowing you to monitor battery status at a glance. After installing and welding batteries, a quick activation step is required: charge the power bank for 3–5 seconds to enable normal operation.
Compact and Reliable Design
Measuring approximately 153 × 55 × 34 mm, the case is compact yet robust. It's constructed from durable ABS-PVC material with a transparent shell for aesthetic appeal and inspection convenience.
Designed for safe travel, the completed power bank can be carried on planes without declaration when correctly assembled.
Key Specifications
Capacity: 20000mAh (requires 4×21700 batteries not included)
Material: ABS-PVC
Size: 153×55×34 mm
What's in the Box
1 DIY power bank case set including the motherboard and casing. Note: Batteries, welding wires, and charging cables are not included.