4x18650 DIY Power Bank Case 5V Dual USB Solderless Kit

4x18650 Solderless DIY Power Bank Shell — Dual USB Output, 5V

Build your own portable charger with this compact, solderless 4×18650 battery holder power bank case. Designed for makers, hobbyists, and electronics enthusiasts, this DIY shell lets you create a fully functional mobile charging station using four standard 18650 lithium cells (batteries not included). No soldering required — just insert your batteries, snap on the cover, and you're ready to charge.

Made in Mainland China.

Key Features

• Dual USB Output: Two USB ports deliver 5V-1A and 5V-2A simultaneously — charge two devices at different speeds at the same time.
• Micro USB Charging Input: Recharge the power bank itself via the onboard Micro USB port at 5V-1A.
• Smart LED Battery Indicator: Four LED lights display remaining capacity in 25% increments (25% / 50% / 75% / 100%) at a single button click.
• One-Button Control:
  • Single click → display current battery level
  • Hold 3+ seconds → turn on/off the output LED light
  • Double click → cut output and turn off indicator lights
• Solderless Design: No tools or soldering required for assembly — perfect for beginner and advanced DIY projects alike.
• Durable Plastic Housing: High-quality plastic shell that is lightweight yet sturdy.
• Compact Size: 7.9 × 2.1 × 11.5 cm — pocketable and travel-friendly.

Specifications

Important Battery Safety Notes

• Always install batteries with the correct polarity (+ / −). Reversed installation may damage the circuit board.
• Inspect batteries before use — do not use cells that show peeling, leaking, rust, or deformation.
• Use a multimeter to verify battery voltage. Do not use cells below 3V (over-discharged); cells below 3.5V may not provide stable output until fully recharged.
• If any individual cell generates excessive heat during use, remove it immediately — this indicates high internal resistance.
• For best DIY results, use four batteries with consistent capacity and voltage ratings.

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Learn more: ENERGY STAR product efficiency guidance

Frequently Asked Questions

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

A: No, batteries are not included. You will need to source four 18650 lithium-ion cells separately. For the best performance, use four cells with matching capacity ratings and similar voltage levels.

Q: Can I charge two devices at the same time using this power bank shell?

A: Yes! The dual USB output ports support simultaneous charging — one port delivers 5V-1A and the other delivers 5V-2A, so you can charge a phone and a tablet (or two smartphones) at the same time.

Q: Do I need soldering skills or special tools to assemble this power bank kit?

A: No soldering or special tools are required. Simply insert your 18650 batteries into the holder with the correct polarity, then close the cover. The solderless design makes it beginner-friendly and straightforward to assemble.

Q: How do I know how much battery is left in the power bank?

A: A single press of the button activates four LED indicator lights that show remaining capacity in 25% increments — so you always know exactly how much charge is available before you head out.

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.