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Harsha Alva
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Mechanical Engineer + Software Developer (Project Leader)
 · MangaluruIndia
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TUTORIAL

[Semi-DIY] Mobile Power Bank

This project is termed as Semi-DIY as a single circuit is used for both charging and protection.

Once you have extracted the 18650 cells from a rechargeable battery, you can use them with a power bank circuit to make a power bank. This can be used to power up Raspberry Pi, Arduinos, and even mobile phones.

The cost of the power bank circuit could be as low as $5 or ₹300.

 

Components

  1. Power Bank circuit board. Buying options are AliExpress, Banggood and Amazon.us

  1. 18650 size cells (3.7V Li-ion). Quantity as per capacity requirement.

 

Steps

  1. Solder all cells in parallel, if there are multiple cells.
    Take care not to connect two different terminals to each other, or else, the pack might explode.
  2. Solder the battery pack to the circuit.
    Again, do the connections to the proper terminals. If done wrongly, the pack might explode, and/or the board might fry.
    Now your bank is ready.
  3. Charge and discharge the power bank a few times.
    The board contains a microcontroller with a small memory that’s used to measure the capacity status. Accuracy improves with time.

Now your Semi-DIY power bank is ready for use!

 

Video Tutorial

By 1nformatica

Another video for reference. It’s in German.

 

Note

  1. All the items listed above are untested.
  2. If you have used any of these, please reply about the quality of the circuit board.

Feedback and suggestions are always welcome!
#Robots #Robotics

Electrical Engineering
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