DIY Portable Power Bank Circuit to Charge Your Cell Phone

The features of the digital products are growing enormously which triggers the frequent usage of smart phones in several applications.  Thus the battery backup time is getting decreased. It will be fun to build a Power Bank for Mobile Phone as spare charging source for emergency purpose which is also portable. In this article we will discover how to make a power bank with a super simple power bank circuit diagram.

The important factor to be considered while working with lithium batteries is protection circuits and quality of batteries. But, when this comes to 18650 cells the risk factor is less compared with pouch batteries. Good protection is offered by few readymade modules available in market.


Components required:

  1. 18650 Lithium cell
  2. TP4056 Module with battery protection circuit
  3. 3V to 5V boost converter with 1A current control
  4. Slide switch

components for mobile phone power bank circuit

Power Bank Circuit Diagram:

Below is the circuit diagram for our power bank. As we can see its fairly easy to make a power bank with li-ion battery, TP4056 module and a boost converter.

mobile phone power bank circuit diagram


18650 Lithium Cell:

The term 18650 cell is due to the cell dimension, it is cylindrical in shape with 18mm diameter and height of 65mm. Also these cells are available in different capacities corresponding to applications. They are rechargeable cells with 3.7v output.

The method of charging a single lithium ion cell requires two stage,

  1. Constant current (CC)
  2. Constant voltage (CV)

During CC the charger should supply constant current with increasing voltage till the voltage limit. Next a voltage equal to maximum limit of cell should be applied during which the current declines steadily to the lower threshold current (i.e., 3% of constant current). All these operation is carried out by the TP4056 module which is highly reliable and affordable choice.


TP4056A Module:

This is a low cost charging solution to charge any type of single lithium ion battery. Mobile batteries, 18650 NMC cells, Lithium pouch batteries, etc. The micro B Receptacle and easy adjustable 1A output current control makes it reliable choice to charge any low capacity batteries. It can be connected to any wall socket based mobile charger or any sort of USB to micro B cable. It is made of an integrated PMOS load switch architecture, hence reducing overall additional components.

TP4056A Module

The module also has two indications, Red color LED (L1) to indicate the ongoing charging condition. Blue color LED (L2) indicates the completion of charging. This module can operate at high ambient temperature since the thermal feedback can regulate the charge current. The charge voltage is 4.2V and current can be adjusted by changing a resistor in the module. But, the default current will be 1A when bought.


The protection circuit includes,

1. DW01x – Single cell lithium ion battery protection IC with dual MOSFET control feature. Below is a application test circuit provided in the datasheet.


2. FS8205A – Dual N-Channel enhancement MOSFET with common drain connection. Also the drain to source resistance is low. The gate of the MOSFET is controlled through the DW01A IC.

Thus, the DW01A provides Overcharge control, Over discharge control, Overcurrent control by controlling the MOSFET through the circuit.


Micro USB 3V to 5V Boost Converter:

Lithium battery is only providing 3.7 volt here but we need 5v to charge the Cellphone, so we have used 3v to 5v boost converter module here. This boost converter module has high efficiency of upto 92% and integrated over current protection. The topology used inside is Non-isolated step-up converter which operates at a switch frequency of 1MHz. The overall power output that can be drawn out of this module is 5W. The output voltage can be adjusted to 12V by changing a resistor in module but the maximum current will be 400mA. But by default this module is available at a rating of 5V, 1A. Under this rating the output ripple is 20mV pk-pk. The module also has USB type-A female receptacle which is universal. Any USB power cable can be used as interface. The operating temperature of the module is -40°C to +85°C. It also has an LED indication to indicate the presence of supply from battery source. The Red color Led indicates the presence of power supply across the terminals.

5V Boost converter module

We previously used the same module in Solar Mobile Phone Charger Circuit.


The modules were connected and fixed to a plastic plate using hot glue.

mobile phone power bank circuit with lithium cellcell phone power bank circuit


Charging the Power Bank:

Red color LED indicates the battery charging in this power bank circuit,

red led charging signal for charging mobile phone power bank


Blue color LED indicates the charge complete,

blue led charging complete signal for mobile phone power bank


Charging the Mobile Phone with this Power Bank:

1. Connect the USB to micro B cable to the output of boost converter.

charging mobile phone using power bank circuit


2. Turn the slide switch ON.

charging mobile phone using power bank circuit


3. The mobile phones battery starts to get charge from the power bank

Power Bank Mobile Phone Charger Circuit


So this is how you can easily make Power Bank Circuit for charging your Smart Phones.


Comments (15)

  • M C's picture
    M C

    How can you increase the powerbank's capacity, like for example bout 10000mAh?
    Would there be any changes with regards to the module used?

    Sep 22, 2017
  • Arvind Ragupathy's picture
    Arvind Ragupathy

    To increase capacity number of lithium cells can be increased in parallel.
    When using the same module arrangement the charging time increases
    equally to the capacity, Eg: 10000mAh takes about 10 hours to charge from
    empty to full. But, there is no other problem in using in that way. Ensure the
    cells that are connected in parallel are of same capacity (For eg : 3.6V, 2200mAh).

    Oct 02, 2017
  • mijas's picture

    how much time does it take to charge cell phone>?

    Oct 25, 2017
  • Tomás cichero's picture
    Tomás cichero

    how can I increase the current to 2A?

    Nov 04, 2017
  • B.Aswinth Raj's picture
    B.Aswinth Raj

    I don't think increasing the current is an easy task here. You will need major modifications

    Nov 06, 2017
  • Renato Lazzari's picture
    Renato Lazzari

    What about connecting 2 (or more) TP4056 in parallel? Of course, thinking in a power source wich can handle, say, 2A (or more)... Could it work?

    Dec 28, 2017
  • B.Aswinth Raj's picture
    B.Aswinth Raj

    This module is designed to charge a 18650 cell whose full charge voltage is 4.2V. Also the charging current of these cells are rated less than 1A. So why do you need a 2A charger? A charging current of 2A or more could easily kill a 18650 cell.. 

    The idea of using two modules in parallel might actually work though 

    Dec 29, 2017
  • William's picture

    Anyway you can give me a website i could purchase the parts from?

    Nov 21, 2017
  • lumy's picture

    this circuit does not have an over-discharge protection? because the booster is fixed to the battery, hence the TP4056A can't prevent over-discharge?

    Jan 02, 2018
  • B.Aswinth Raj's picture
    B.Aswinth Raj

    This circuit does have a over-discharge protection.

    The booster is connected to the output of the TP4056A module. If the booster drains too much current from the battery the TP4056 will prevent it from doing so.

    Jan 04, 2018
  • lachlan's picture

    There is no over-discharge protection. The booster is connected in parallel to the battery and TP4056, thus even if the TP module was powered on it would have no control over the discharge from the booster. To fix this you need a discharge protection IC in series with the booster and battery.

    Jan 06, 2018
  • Junaid Ahmad Sofi's picture
    Junaid Ahmad Sofi

    Can we use old mobile battery/s in place of 18650 cell

    Jan 02, 2018
  • B.Aswinth Raj's picture
    B.Aswinth Raj

    Good idea and it would most likely work I guess. Why not give it a try!!

    Jan 04, 2018
  • pooja's picture

    which type of battery used protected/unprotected lithium celll????

    Jan 05, 2018
  • B.Aswinth Raj's picture
    B.Aswinth Raj

    The battery used here 18650 lithium cells.. and they do not come with protection circuit

    Jan 09, 2018

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