4×18650 DIY Power Bank Case – 5V Dual USB Charging Shell

Build your own portable charger with this compact 4×18650 DIY Power Bank Shell Case. Featuring dual USB output ports and a solderless design, this kit lets hobbyists and makers assemble a fully functional mobile power bank with ease — no soldering iron required.

Made in Mainland China.

Key Features

• Dual USB Output: Two USB ports deliver 5V-1A and 5V-2A simultaneously, so you can charge two devices at different speeds at the same time.
• Micro USB Input: Recharge the power bank itself via the Micro USB port at 5V-1A.
• One-Button Control: Single click to check battery level; press and hold 3+ seconds to toggle the built-in LED light on or off; double-click to cut output and turn off all indicators.
• 4-Level LED Battery Indicator: Four LED lights represent 25%, 50%, 75%, and 100% charge — always know how much power you have left.
• Solderless DIY Design: No welding needed — simply insert four standard 18650 cells (not included), secure the cover, and you're done.
• Durable Plastic Shell: High-quality plastic construction is lightweight yet sturdy, with a compact footprint of 7.9 × 2.1 × 11.5 cm.

Specifications

• Compatible Batteries: 4 × 18650 Li-ion cells (batteries NOT included)
• Output: USB-A 5V-1A & 5V-2A (dual port)
• Input (charging): Micro USB 5V-1A
• Material: Plastic
• Dimensions: 7.9 × 2.1 × 11.5 cm
• Package Contents: 1 × Power Bank Shell Case (batteries not included)

Installation Tips

1. Before inserting cells, inspect each 18650 battery for peeling, leakage, rust, or deformation — do not use damaged cells.
2. Use a multimeter to verify each cell is at or above 3V before installation. Deeply discharged cells may not provide adequate output.
3. Always match positive (+) and negative (−) poles to the marked terminals inside the case. Reversed polarity can damage the circuit board.
4. For best DIY results, use four cells with similar capacity and charge level to ensure balanced performance.
5. Once batteries are checked and correctly installed, snap the cover closed — your DIY power bank is ready to use!

Great For

• Electronics hobbyists & makers
• Outdoor adventures, camping, and travel
• Emergency backup charging
• DIY electronics projects and prototyping

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Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: Do the 18650 batteries come included with the DIY power bank case?

A: No, the four 18650 lithium-ion cells are NOT included. You will need to source compatible 18650 batteries separately. Be sure to use cells with a voltage of 3V or higher and check them for any signs of damage before installation.

Q: Can this power bank case charge two devices simultaneously?

A: Yes! The case features two USB output ports — one rated at 5V-1A and one at 5V-2A — allowing you to charge two devices at the same time with different power requirements.

Q: Is soldering required to assemble this DIY power bank kit?

A: No soldering is required. This is a fully solderless design — simply insert four 18650 batteries with correct polarity, check the indicators, and close the cover. It is ideal for makers and beginners alike.

Q: How do I know how much battery charge remains?

A: A single click of the button activates four LED indicator lights on the board, representing 25%, 50%, 75%, and 100% of total capacity, giving you a quick visual status of your remaining power.

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.