DIY 100W PD Power Bank Case for 4×21700 Batteries

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.

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

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.

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.

Capacity: 20000mAh (requires 4×21700 batteries not included)

Material: ABS-PVC

Size: 153×55×34 mm

1 DIY power bank case set including the motherboard and casing. Note: Batteries, welding wires, and charging cables are not included.