How to Make a Mobile PowerBank




About: Hello Guys, I am techgenie, an Electronics hobbyists, tech tinker and developer. I dedicate my free time in designing and making various creative and innovative projects, RC toys, Incredible Gadgets, Awesome...

Powerbanks are an essential products for our Energy consuming gadgets..It is very difficult to maintain the battery charge throughout the day while using your phone to even half its potential. So, it is important to keep a backup supply always.

In this Instructable, i decided to use my old Laptop battery and make a mobile powerbank from the salvaged cells. A Laptop battery needs replacement every few years but all the Li-ion cells inside it are never damaged. They can be extracted and used for various other purposes.

Note: This PowerBank is only capable of charging Android devices. To charge an ios device it needs a special value of voltage (D+ = 2.76v & D- = 2.06v for 1A current draw and d+ = 2.0v & D- = 2.0v for 500mA current draw) at the data pins that can be easily made using a voltage divider circuit with few resistors. But since i needed it for android devices, so didn't worry much about providing voltage at data pins.

Step 1: Order Parts

  1. TP4056 Charging Module -
  2. 3.7v to 5v Boost Converter -
  3. Solder Tabs -
  4. Switch -
  5. Soldering Iron -
  6. Hot Glue Gun -
  7. 3.7v Li-ion Battery -

  1. TP4056 Charging Module -
  2. 3.7v to 5v Boost Converter -
  3. Solder Tabs -
  4. Switch -
  5. Soldering Iron -
  6. Hot Glue Gun -
  7. 3.7v Li-ion Battery -

  1. 3.7v Li-ion Battery -
  2. TP4056 Charging Module -
  3. 3.7v to 5v Boost Converter -
  4. Solder Tabs -
  5. Switch -
  6. Soldering Iron -
  7. Hot Glue Gun -

From Home & Local Store: Cardboard, Double Sided Tape and Connecting Wires.

Step 2: Watch the Video

A video is a wonderful tool that provides deep insight to the procedure and makes it easy to follow. However, also visit next steps for additional details and images.

Step 3: Prepare Li-Ion Batteries

In case you bought new Li-Ion cells, you can skip this step.

If you are also using an old Laptop battery like me, then you can proceed. The laptop batteries are made up of multiple Li-ion cells connected together in certain combinations. When the battery stops charging or becomes faulty, it has mostly been seen that only few cells get damaged, whereas all other cells work well. We will use those cells to make a powerbank at home.

  1. Carefully open the laptop battery without damaging the cells inside.
  2. Using wire stripper, cut the solder tabs connecting the cells.
  3. Separate each cells and clean them with a damp cloth to remove the adhesive.
  4. Using a multimeter, check the voltage of each individual cells.
  5. Discard the cells with voltage less than 2.5v as they might be damaged and will be difficult to revive.
  6. I got four perfectly working batteries out of six.

Step 4: Connect the Cells

  1. Clean the cell terminals properly and if required, you can also sand them gently using sandpaper.
  2. Place all the cells adjacent to eachother.
  3. Apply some solder over the terminals. Note: Make sure to be quick and prevent cells from getting hot.
  4. Take solder tabs and apply solder to both the edges.
  5. Place the solder tab over the cells and connect it to the cell terminal using soldering iron.
  6. Connect all the cells in parallel using the solder Tabs.
  7. Each cell is 3.7v 2200 mAh, so now we have a 3.7v 8800 mAh battery bank.
  8. Also, connect wires to the battery terminals.

Step 5: Make the Enclosure

  1. Take a sheet of cardboard.
  2. Place the battery over the cardboard and mark the dimensions.
  3. Using the dimensions, make a box to fit the batteries and the electronic circuit.
  4. The design can very with your choice of placement of the components.
  5. Be creative and make your own design.
  6. Mark the space for the components, so they can be placed easily.
  7. Using knife, cut the slots for switch, USB port and Micro USB Port carefully.
Note: Make sure to refer to the images attached above or watch the video.

Step 6: Connect the Components

  1. Using Double sided tape, attach the batteries to the Enclosure Base.
  2. Place the TP4056 charging Module at the designed space and secure it with Double sided tape.
  3. Similarly, place the 5v boost converter in the designed space and secure it with double sided tape.
  4. Secure the switch in the slot using Hot Glue.
  5. Refer to the circuit schematic above and connect the components using Soldering iron.
  6. Before testing the powerbank, it is important to check the output voltage in order to protect your mobile phone from any damage.
  7. Using multimeter, test the output voltage of boost converter and regulate it to 5v using potentiometer knob.
  8. Plug in a USB cable and test the powerbank.
  9. Cut a piece of cardboard piece to cover the box.
  10. Make a slit at the top for the indicator light on the charging module as shown in the image above.
  11. Using Hot glue, seal the box completely.

Step 7: Test Mobile Powerbank

Our Homemade Mobile Powerbank is now ready. Plug in a USB device and see it charging quickly with this 8800 mAh powerbank.

So friends, this here concludes the instructable, stay tuned and Follow to receive regular updates. In case you might have missed, watch the video and see how i made this mobile Powerbank at home.

Make this amazing gadget yourself and contact us or share your experiences on our facebook page, twitter and instagram. You can also SUBSCRIBE to our Youtube Channel GOODTECH - Creativity And Science, where i frequently post new and creative content.

I also made a emergency hand operated mobile charger that uses DC motor as generator. Have a look at the instructable here or watch the video below.

Thanks For Your Support..!!



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    12 Discussions


    3 months ago

    Minutes....are your each cell are PROTECTED....IF NOT, I NEVER DO THAT ....because the cell will not be charge equal...not balance....the MODULE IS FOR SINGLE CELL CHARGER, READ the Datasheet NOT a Pro but i dont want burn down my house...dont play with Li-Po if your not sure

    Sajal chuttani

    4 months ago

    How did you contol the current (every phone needs different like 1amp or 2.1 amp)

    1 reply
    TechgenieSajal chuttani

    Reply 4 months ago

    No, you don't need to control the current. The powerbank should be capable to supply enough current and the device only draws the current it needs.
    I connected four 2000mAh Li-ion batteries in parallel making a current capacity of 8000mAh or 8Ah.


    Answer 10 months ago

    No, a 12v battery cannot be charged with TP4056 module. Also, 12v battery doesnt need a boost converter.

    If you want to use a single 12v battery. You need a 7805 voltage regulator IC to convert it to 5v and also a heat sink over the regulator to absorb extra heat.


    Reply 11 months ago

    The design you showed seems good but the batteries cannot be charged with a 5v mobile adapter because the two batteries connected in series have resultant of 7.4v 4000mah current(two such piar makes it 7.4v, 8000mAh), for this you atleast need a 9v 2A power adapter to efficiently charge all the 4 batteries in around 5 hrs. Also, there is no over-discharge protection.


    Answer 1 year ago

    Yes, it can be used with any number of cells. Only thing to consider is that they should be connected in parallel, so the input voltage if 3.7v.

    Also, the charging time of power bank will increase with more batteries.