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tp4056 lipo battery charger circuit

TP4056 LiPo Battery Charger For RC Toys

Lithium Polymer (LiPo) battery is a type of rechargeable battery that provides high energy storage to weight ratios in an eternal variety of shapes and sizes. LiPo batteries has taken the electric RC gizmos world by storm,especially for Radio-Controlled (RC) toys like electric helicopters, airplanes and boats.

Unlike conventional NiCad (or NiMH) cells that have a voltage of 1.2 volts per cell, LiPo battery cells are rated at 3.7 volts per cell. The benefit here is fewer cells can be used to make up a rich battery bank. In practice, RC LiPo battery packs should have at least two or more LiPo cells hooked up in series to provide higher voltages. For larger RC models this number may be as high as 6 cells!

3.7V lipo battery

3.7 Volt LiPo battery /1 cell x 3.7 volts (1S)

Charging LiPo cells/batteries is not an easy task. LiPo battery obviously have a very different characteristics from conventional rechargeable battery types. Therefore, charging them correctly with a charger specifically designed for lithium chemistry is critical to both the life span of the battery pack, and ofcourse your safety.

Note that a 3.7 Volt battery is 100% charged when its terminal voltage reaches 4.2 volts, and selecting the correct charge current is also very crucial when charging battery packs, because over charging will ruin the battery, possibly cause it to catch fire. As LiPo batteries require special charging algorithm, never attempt to charge these batteries with anything but a dedicated Lithium Polymer battery charger.

tp4056 pins

Fortunately, single-chip solutions are now widely available for Li-Po battery charging. The tiny chip TP4056/YP4056 is a good example. The TP4056 IC is a complete constant current/constant-voltage linear charger for single cell lithium-ion/Lithium Polymer (LiIon/LiPo) batteries. Its SOP-8 package and low external component count make the TP4056 ideally suited for portable applications.

Furthermore, the TP4056 can work within USB and wall adapter. Other features include current monitor,under voltage lockout, automatic recharge, and two status pin to indicate charge termination and the presence of an input voltage.

tp4056 module

However, construction of the LiPo battery charger using this IC is a cumbersome task for an average hobbyist having zero skills in SMD prototyping. As an alternative (thanks eBay), just buy and ‘hack’ a ready-made module of TP4056 to complete the project without any difficulty.

tp4056 lipo battery charger circuit

First of all carefully observe the TP4056 module, and its circuit diagram.Thereafter, start the fabrication process as per the guidelines given here:

  • Locate the position of the resistor R4 (1K2), and carefully remove it from the top of the PCB using a soldering pencil
  • Extend short-length of two multi-stranded wires from the solder pads
  • Attach the new resistor network (1K2 1’4 W resistor+10K LIN preset potentiometer) to the wire ends, ie in place of the original R4 smd resistor
  • Feed USB power to the module input from any USB port, set the preset pot to zero Ohm (0R), connect a 3.7V LiPo battety at the module output, watch the onboard LEDs, and ascertain that everything is OK

tp4056 modification

Yes, your own portable LiPo charger, capable of charging any single-cell LiPo from USB power (5V), or from an external dc source (4 to 8V) is now ready for use. With the help of the 10K preset pot, it is possible to adjust the LiPo charging current from near 200mA to 1000mA. A current setting chart (obtained from the mfr.) is also included here for your quick reference.

LiPo charging current

Also refer the LED status chart for better system evaluation (remember, LED colors may vary from module to module).

led status

Lab Note:

Prototype tested with USB power input (5V) from a laptop, and external dc input (6V) from a lab power supply. Charging current for the battery (3.7V/1100mAh LiPo) is programmed to about 500mA using the 10K preset pot.
It’s Alive… and quite lovely as well!

19 Comments

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  • nilswongyandex-com

    Can i charge those cells with laptop usb output, i.e directly connecting usb output to the cells for charging ?
    How many cells can i charge in tp4056 circuit board ?
    If i connect all the cells in parallel it becomes 13000mA to get more backup from that cells, so then can i charge the combination of those cells on the tp4056 circuit board ?

  • goel-hardik2011gmail-com

    I have a question can I charge a 2 * 3.7v Li-ion battery pack connected in series using TP4056?

  • Raunak

    And the IC-4056 point 1 has 2 register connected … What are the values of it ….

  • Raunak

    What are R1,R2,R3 …. I cannot understand …. Help me plz

  • prasang

    can i use this circuit or any other if i want to charge 10 cells connected parallely each of 3.7 volt 2200 mah . with auto cut off when they are fully charged

  • vinayak

    hello sir,
    i buy a tp4056 circuit. how i can use this circuit as a my power bank circuit ?
    how to get output from the circuit
    plz tell me

  • JoGusto

    IMPORTANT! The term “Li-PO” describes the method of construction for the battery. It does NOT describe the battery chemistry! Li-Po batteries use a polymer electrolyte element, which distinguishes them from “ordinary” cylindrical Lithium batteries.

    BUT, you MUST pay attention to the voltage of the battery. This is determined by the chemistry: Lithium (Metal) Ion, Lithium Iron Phosphate, etc.

    NEVER try to charge a Lithium Iron Phosphate battery with the circuit shown here. The charge-top voltage for these cells is MUCH lower than those of Li-Ion chemistry, and using a LiIon charger with this cells may ruin the cell, cause it to explode or catch fire, etc, especially if the cell does not have built-in protection circuitry.

    Lithium based cells have wonderful energy density and high current capabilities, and, they are very easy to charge, with predictable characteristics and a simple CV/CC algorithm. However, the cutoff voltage and maximum currents must be strictly observed, otherwise the “beast” living inside those cells will be unleashed.

    Is your RC hobby worth having a house fire? Be aware, take care! Used properly, they are great. Mishandled in the wrong charger, possibly deadly!

  • mohammad

    hi

    I need a lithium battery charger 2A

    I am Afghan, and I do not speak good English
    I apologize

  • jagjeet

    how many 3.7 volt batteries(2200mah) we can connect in parallal with this tp4056 board…please tell me sir

  • ion

    I need to use usb data + and – for communication with the board where the battery is connected.
    I can of course connect the pins( solder some wires.
    My problem is what will happen if i put it to charge from wall – 7 volts dc, and during the charge suddenly i want to read some data, but i forgot is plugged to the wall.
    i will have 7.5 volts at IN and 5 volts at Vbus !!!!!
    It is no isolation in between
    Any solution ?

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