How to Make 3.7v Battery Charge Protect Circuit

Introduction: How to Make 3.7v Battery Charge Protect Circuit

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In this tutorial, I will show you how to make your own 3.7v lithium ion battery charger with some of electronic components.

Very easily you'll learn this.

Step 1: Materials Required

1. Diode 1N4007

2. Green Led

3. Red Led

4. 220ohm resistor

5. 1k resistor

6. Male berg strip

7. BC547 transistor

8. 10k Pot

9. Female usb connector

10. Zero Pcb

11. Connecting Wires

Step 2: Circuit Diagram

Use this diagram for making this project.

Step 3: Gerber Files and Pcb Diagram

If you want to make your pcb from any website you'll need gerber file.

So, I am sharing gerber file of this project.

And if you design your own Pcb then use pcb pdf for pcb etching.

Step 4: Tutorial Video

As a preference I am sharing a tutorial video of this project from my YouTube Channel.

View complete video.

And like, share, comments on this video if you are
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I hope you enjoyed this project.

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    Question 7 months ago on Step 4

    What is wrong using TP4056 with protection? It's common and very cheap.


    Answer 7 months ago

    What was interesting about this is I wrongly assumed the ability to cut off charging at a voltage point I select and which will start charging no matter how low the cell is in voltage at the start. Its poor work but I will adjust it to suit me. TP4056 does not give me those choices.
    For more on Lithium batteries try here but you will have to join.


    Answer 7 months ago

    Okay, Its common and very cheap.
    But what if learn to make our own one.


    Question 7 months ago

    So I want to charge my cell to 3.4 volts only being a LFP cell rather than a LiIon.
    Can I do it with these components ? How much current will your circuit pass?
    Would it not be better to use a Mosfet.
    For more on Lithium batteries try here but you will have to join.


    7 months ago

    RV1 is marked as 1K in the drawing and 10K in the parts and 10K in the video. Which is it? I think 10K.
    With these circuits the basic premise is to explain why the circuit works , how to adjust any adjustments and how to connect to and from it . You don't cover any of them . Do you know?

    Looking at the circuit it is power straight through to the battery all the time so its not controlling charge only giving you lights when the voltage is at points set by the resistors . Swap J1 180 degrees and you can draw lines direct . Its not very useful im afraid.

    Your circuit board has many faults but mainly there are no clearances on pads. You just cant use that to make a board. I just really wonder what your purpose is here?