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

 

🔋 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.

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🧒 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.

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⚙️ What He Used

Component	Specs / Notes
18650 Li-ion Cells	2 × 2000mAh cells (total 4000mAh)
TP4056 Charging Module	With protection circuit
Boost Converter	5V output for USB charging
USB female port	For connecting charging cable
On/Off switch	For safety and power control
Small plastic casing	From old power bank or DIY box
Wires + hot glue	For connections and fitting

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🔧 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

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🔋 Power Stats

• Capacity: 4000mAh

• Input: 5V Micro-USB

• Output: 5V/1A (via USB)

• Charging time: 4–5 hours

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📷 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!”

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🧠 Why It’s a Great Project

• Learn battery management

• Practice soldering and wiring

• Understand voltage conversion

• Useful and creative electronics experience