🔋 Mini Power Bank Made by Ahmed – 4000mAh DIY Project

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🔋 Mini Power Bank Made by Ahmed – 4000mAh DIY Project


Power banks are essential in today's mobile world, but building your own adds a creative and personal touch! Here's a story and step-by-step guide on how Ahmed built a 4000mAh mini power bank using basic electronic parts.


🧒 Creator's Intro

Ahmed, a young DIY electronics enthusiast from Pakistan, decided to make a mini, portable power bank for his phone — compact, rechargeable, and pocket-friendly.

⚙️ What He Used

ComponentSpecs / Notes
18650 Li-ion Cells2 × 2000mAh cells (total 4000mAh)
TP4056 Charging ModuleWith protection circuit
Boost Converter5V output for USB charging
USB female portFor connecting charging cable
On/Off switchFor safety and power control
Small plastic casingFrom old power bank or DIY box
Wires + hot glueFor connections and fitting

🔧 How He Made It – Step-by-Step

✅ Step 1: Assembling Batteries

  • He connected two 18650 cells in parallel for a combined 3.7V 4000mAh output

  • Used a spot welder (or soldered carefully)

✅ Step 2: Charging Circuit

  • Attached a TP4056 module to charge the batteries via Micro-USB

  • This module also provides overcharge and short-circuit protection

✅ Step 3: Boost Converter

  • Connected the battery output to a 5V boost converter

  • Then linked it to a USB female port for charging phones

✅ Step 4: Enclosure

  • Fixed all parts in a plastic box

  • Secured with hot glue

  • Added an on/off switch to control power

✅ Step 5: Testing

  • Plugged in his mobile – and it worked!

  • The mini power bank gave around 1 full phone charge

🔋 Power Stats

  • Capacity: 4000mAh

  • Input: 5V Micro-USB

  • Output: 5V/1A (via USB)

  • Charging time: 4–5 hours

📷 Ahmed’s Comment

“I built this power bank to learn how charging circuits and batteries work. It's small, easy to carry, and I feel proud using my own creation!”

🧠 Why It’s a Great Project

  • Learn battery management

  • Practice soldering and wiring

  • Understand voltage conversion

  • Useful and creative electronics experience

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