DIY 100W Portable Charger Case for 4x 21700 Batteries

This is a DIY power bank case designed for 4 pieces of 21700 batteries (not included). Batteries must be welded in series, connecting the positive and negative poles to the motherboard terminals labeled "B+" and "B-". After assembly, charging activates the power bank for normal use.

Supports full protocol bidirectional PD fast charging up to 100W, compatible with multiple fast charging standards including QC, AFC, and SCP.

• 100W output for laptops, phones, and tablets
• Dual Type-C ports support up to 20V/5A and 20V/3A respectively
• USB port supports various voltage outputs up to 12V

The transparent black ABS-PVC case houses an imported LED screen to monitor remaining power in real time, providing clear battery status during use.

• Durable ABS-PVC material
• Real-time digital power indicator
• Sleek and modern appearance

• Capacity supports 4×21700 batteries (approx. 20000mAh)
• Size: 153×55×34 mm
• Input: DC 5V/3A, 9V/3A, 12V/1.5A, 10V/2.25A
• Outputs: Type-C1 up to 20V/5A, Type-C2 up to 20V/3A, USB varied voltage up to 12V
• Color: Black

Includes one DIY power bank case kit, comprising the motherboard, casing, and necessary non-battery accessories for assembly.

• Battery cells and charging cables are not included
• Wires for welding are not included