In this tutorial, you will learn how to make a power bank from scrap Laptop Battery and make your own Charger using TP4056 and display the charging information using the lithium battery voltage indicator display module. This power bank can also be used for the emergency lighting, and can also be used to power up some small electronic circuits. This Power Bank can be charged using a regular Cell Phone Charger or it can also be charged using a Small Solar Panel.
I Practically checked this Power Bank and I was able to charge a cell phone and run emergency lights for hours.
Charging a Cell Phone.
Running emergency lights using white color led’s.
This is the Final circuit which is used to charge the Power Bank and display the Voltage information. As you can see it has the Voltage display indicator, TP4056 Charger, a USB Port and a Terminal Block. In this Tutorial, I will explain each and every step so that you can make the same exact circuit without any problem.
Note: For Step by Step explanation watch Video Tutorial given at the end of this Article.
The components and tools used in this project can be purchased from Amazon, the components Purchase links are given below:
Arduino Uno: https://amzn.to/2SgsI1V
Mega 2560: https://amzn.to/2ze1kdu
Lithium-Ion cells: https://amzn.to/2Sgt2Ob
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lm7805 Voltage Regulator: https://amzn.to/2IZEl5x
330-ohm resistors pack: https://amzn.to/2NtlAeh
female DC power jack socket: https://amzn.to/2KEo1gt
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5×7 cm Vero board: https://amzn.to/2OHGbvn
female headers: https://amzn.to/2zqmtiJ
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Cells from Laptop Batteries:
These laptop batteries are not fully dead and still can power up my laptop for around 40 minutes. But for me this is not enough so I decided to purchase a new battery for my laptop and decided to convert these batteries into a power bank.
First of all cut these wires as we don’t need this circuit for now, but later we can use this circuit in some other project, remove all the taps..Separate all the cells.
As you can see all the cells are separated,
if you check every pair of these cells, you will find every cell is marked with a plus and minus sign, the positive sides are connected together and also the negative sides are connected together, so these cells are connected in parallel.
Now to further improve the current I will connect all the batteries in parallel.
I will simply connect the positive sides together and similarly for the negative side, so this way I can improve the current capacity of the power bank, if you want you can increase the number of cells.
Lithium Battery Voltage Indicator Display 1S 3.7V:
This is the Lithium Battery Voltage Indicator Display 1S 3.7V and can be used with voltages ranging from 3.3v to 4.2 volts.
* 25% When the battery voltage is over 3.3V, it will light up 1 block power amount
- 50% When the battery voltage is over 3.5V it will light up 2 blocks
- 75% When the battery voltage is over 3.7V, it will light up 3 blocks
- 100% When the battery voltage is over 3.9v it will light up 4 blocks
- When the battery voltage is under 3.3V, all the 4 blocks will turn off and only the external Red Line will remain On
Its use very simple as you can see it has two contacts marked with plus and – minus signs. All you need is just solder two wires which later will be connected with the positive and ground wires of the Power Bank.
For the easy soldering I used the insulation tap to keep all the cells in place. Now Let’s start the Soldering.
Connect the negative sides of all the cells together.
now connect the positive sides of all the cells together and solder a red wire.
as you can see red and black wires are connected with the positive and negative sides.
Now let’s solder two wires with the Battery Voltage Indicator.
As you can see the Battery Voltage Indicator ground wire is connected with the ground wire of the power bank.
When the positive wire of the power bank is connected with the positive wire of the battery voltage indicator the display is turned on.
This is a 5V 1A 3.7V Lithium Cell / Battery Charger TP4056 mini USB Module which will be used for charging the power bank.
Input voltage- 4.5V to 5.5V.
Full charge voltage is 4.2V.
This module has two led’s which are used as the indicators.
Red led indicates the charging while the Blue led indicates that the battery is fully charged.
Over here we can connect a cell phone charger.
As you can see we have battery plus and battery minus contacts which later will be connected with the power bank.
I connected a cell phone charger to check the voltage,
As you can see the voltage is greater than 4volts which is best for charging the power bank.
Fix the voltage indicator and battery charger on the Vero board.
As you can see the components are fixed, now we will connect the power bank, voltage indicator and charger all together.
First apply some solder to the positive and ground contacts of the charger, then connect the ground wire of the display with the battery minus contact of the charger and connect the positive wire of the display with the battery minus contact.
Now connect these positive and ground wires with the terminal block where we will later connect a power bank.
So now you can see the charger and voltage indicator display are connected with the terminal block.Now let’s check this circuit before we connect a USB Port for the cell phone, connect the ground and positive wires of the Power Bank with the terminal block.
As you can see everything is working and now we can proceed.
This is the A type USB port and as you can see it has four pins 1, 2, 3, and 4. Pin number 1 is the positive and pin number 4 is the ground, while the middle two pins are the data pins. For the power bank we only need pin number1 and pin number 4.
First solder the support legs of the USB port with the Vero board to keep it fixed in place. Now solder pin number of the USB port with the positive pin of the terminal block and solder pin number 4 of the USB port with the ground pin of the terminal block.
After all the connections are done then use a digital Multimeter to check the continuity and short circuit and make sure the TP4056 charger bat + and bat – terminals are connected with the USB port, Terminal Block and the Voltage indicator.
Now as you can see the circuit is ready, there is no short circuit. Now we can connect a cell phone, The Power Bank with the Terminal Block and use a cell phone charger to charge the power bank using the TP4056 charger.
For the Practical testing you can watch video given below.
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