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DIY 100W Power Bank Case for 4x 21700 Batteries

DIY power bank case designed for 4x 21700 batteries (not included). Supports 100W bidirectional PD fast charging and real-time LED power display.

Color

Clear

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Estimated Delivery Time3–7 business days

Modular design for DIY enthusiasts

This power bank case is designed to house 4pcs 21700 batteries (not included) which must be connected in series and welded to the motherboard. After assembling and activating the unit with an external power supply, it functions as a versatile portable charger.

Its transparent ABS-PVC body showcases an imported high-quality LED screen that displays the remaining battery level clearly in real time.

High-capacity and fast charging support

With a capacity for 20000mAh through four 21700 batteries, it supports full protocol bidirectional 100W fast charging. Compatible with multiple protocols including PD, QC, AFC, and SCP, it can charge laptops, tablets, and phones efficiently.

Supports 100W PD fast charging input and output
Multi-protocol for universal device compatibility
Bidirectional charging for flexible use

Technical details and compatibility

The case measures approximately 153 x 55 x 34 mm and has a black color option. Input specifications include DC 5V/3A, 9V/3A, 12V/1.5A, and 10V/2.25A. Outputs include two Type-C ports and one USB port with varying voltage and current support suitable for laptops and mobile devices.

Input: DC 5V/3A, 9V/3A, 12V/1.5A, 10V/2.25A
Output Type-C 1: up to 20V/5A
Output Type-C 2: up to 20V/3A
USB output supports 5V to 12V range

Safe and reliable operation

The power bank can be carried on planes without declaration, ensuring hassle-free travel. If the motherboard does not respond after welding, charge it briefly to activate the system.

Battery and motherboard compatibility is improved by fully charging and fully discharging the unit 3-5 times, stabilizing the power display readings.