🛠️ MAKER GUIDEJun 25, 2026•⏱️ 1 min read•🇳🇵 Tested in Nepal
Building Custom 18650 Battery Packs with Spot Welder Controller
Construct reliable lithium battery packs for DIY projects and solar storage using Arduino Nano, IRFZ44N MOSFET switches, and nickel strips.
🛠️ BILL OF MATERIALS (BOM)
Required Hardware & Component Checklist
Curated components verified for this project. Check the items you need, adjust quantities, and add straight to cart:
Estimated Total (5/5 items):
NPR 1,580
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NPR 750
NPR 500
NPR 240
(NPR 60 ea)
NPR 40
NPR 50
(NPR 25 ea)
Building Custom 18650 Battery Packs with Spot Welder Controller
Weld nickel strips onto lithium cells cleanly using Arduino Nano pulse timing and a bank of IRFZ44N power MOSFETs.
Hardware Bill of Materials:
- Microcontroller: Arduino Nano V3.0 Solderless
- Display: 0.91 inch OLED module blue OLED 128X32 GND-VCC-SCL-SDA
- Switching Bank: 4x IRF Z44N N-Channel Power MOSFET (in parallel)
- Audio Warning: Active Buzzer (5V)
- Triggers: 2x Push Switch 12x12x7.3mm Tactile Push Button
Circuit Pinout & Wiring Connections:
| Component / Module Pin | Arduino Nano Pin | Function / Description |
|---|---|---|
| MOSFET Parallel Gates | Pin D9 (via 10Ω Gate Resistors) | Millisecond High-Current Pulse Trigger |
| Foot Pedal / Trigger Switch | Pin D2 (INPUT_PULLUP) | Automatic Spot Weld Command |
| Pulse Time Adjust Potentiometer | Pin A0 | Sets Weld Duration (5ms to 50ms) |
| 0.91" OLED SDA / SCL | Pin A4 / Pin A5 | Displays Pulse Width (ms) |
| Active Buzzer (+) | Pin D4 | Weld Arming / Discharge Tone |
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