DIY 4-Slot 18650 Power Bank Box – Solderless Portable Charger
DIY 4-Slot 18650 Power Bank Box – Solderless Portable Charger
Build Your Own Portable Power Bank – No Soldering Required
The DIY 4-Slot 18650 Power Bank Box lets you assemble a custom portable charger in minutes — no soldering, no complicated wiring. Just load up to four 18650 flat-head batteries (sold separately), snap the case closed, and you have a compact, reusable power supply ready for everyday use at home, outdoors, or on the go.
Made in Mainland China.
Key Features
- Solderless Design: Batteries slot directly into the case and are secured with screws — simple to assemble, disassemble, and replace batteries whenever needed.
- Reverse-Polarity Protection: The onboard circuit protects the motherboard if a battery is inserted the wrong way — simply reinsert correctly and you're good to go.
- 4-Level Battery Indicator: LED indicator lights show remaining charge at a glance so you always know when it's time to swap or recharge.
- Dual USB Output: Powers two devices simultaneously at 5V/2.4A (MAX) — ideal for smartphones, earbuds, and other USB-charged gadgets.
- Dual Input Ports: Recharge the power bank via either a Micro-USB or Type-C port (5V/2.1A input; PD/DP not supported).
- Compact & Lightweight: Measures just 103 × 80 × 24 mm — easily fits in a pocket, bag, or backpack.
- Auto Shut-Off: The motherboard automatically powers down when not in use to preserve battery life.
- ABS Housing: Durable, lightweight plastic shell available in Black, White, Blue, and Green.
Specifications
| Material | ABS Plastic |
| Dimensions | 103 × 80 × 24 mm / 4.05 × 3.14 × 0.94 in |
| Battery Slots | 4 × 18650 (3.7V flat-head, no protective plate; each 3.3–4.2V, internal resistance <50 mΩ, 1C discharge rate) |
| USB Output | Dual USB-A, 5V/2.4A (MAX) |
| Input | 5V/2.1A via Type-C or Micro-USB (PD not supported) |
| Power Display | 4-level LED indicator (voltage-based calculation) |
| Colors | Black, White, Blue, Green |
| Batteries Included | No (batteries sold separately) |
Important Safety Notes
- This is a parallel battery box — always load batteries with the same capacity and charge level; never mix old and new or damaged batteries.
- Use only flat-head 18650 batteries with a stable voltage and low internal resistance. Pointed-tip batteries are not compatible.
- High-drain flashlight or radio batteries are generally not suitable — use high-rate cells for stable output.
- If the case becomes warm during use, remove the batteries immediately and inspect them before reuse.
- Recommended for users who are comfortable with DIY electronics assembly. Please read all instructions before purchasing.
What's in the Box
- 1 × DIY 18650 Power Bank Box (batteries not included)
Related Products You May Like
- 10-Pc Hex Nut & Bolt Extractor Kit – HIP Tools
- 1/2" Drive 8-Piece Hex Short Socket Set – Vanadium Steel
- 105° Right Angle Driver with 1/4" Hex Screwdriver Bit
Learn more: EPA guidance on lithium-ion battery handling
Frequently Asked Questions
Q: What type of 18650 batteries are compatible with this power bank box?
A: This DIY power bank box is designed for 3.7V flat-head 18650 batteries with no protective plate, internal resistance under 50 mΩ, and a voltage between 3.3V and 4.2V per cell. Pointed-tip batteries and low-drain cells (such as those used in flashlights or radios) are not compatible. For best results, use high-rate 18650 cells with a minimum capacity of 1200mAh each.
Q: Does this power bank box support fast charging (PD/Quick Charge)?
A: No — the input ports (Type-C and Micro-USB) accept standard 5V/2.1A charging only. PD (Power Delivery) and DP protocols are not supported. The dual USB-A outputs deliver up to 5V/2.4A (MAX) combined for charging your devices.
Q: How many devices can I charge at the same time?
A: The case features dual USB-A output ports, so you can charge two devices simultaneously. Total output is shared at 5V/2.4A (MAX) across both ports.
Q: Is soldering required to assemble this power bank?
A: No soldering is needed at all. Simply insert up to four compatible 18650 flat-head batteries into the slots, secure the cover with the included screws, and the unit is ready to use. Batteries can be swapped or replaced at any time.
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.