How to Make Battery Charger at Home





Introduction: How to Make Battery Charger at Home

Li-Ion batteries (18650 cells) are very widely used in all the electronics gadgets that we use today like mobile phones, laptop, powerbanks, etc. These batteries provide good backup and are a reliable source of power, therefore are also very convenient to use in DIY projects. However, charging these batteries is still hassle as the commercial chargers are quite expensive. Also, a good quality charger is essential for Li-Ion batteries, otherwise the battery life will get degraded soon. A balanced charger does the job well but it is available in higher price range.

So, in this instructable i decided to make a Li-Ion battery charger that can simultaneously charge four 18650 cells together. This charger is very simple to make and performs the work of a balanced charger by stopping the power to the individual cells after the battery gets charged completely.

Step 1: 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 info and images.

Step 2: Order Parts

Step 3: Let's Begin

  1. Take the general purpose PCB board and place the batteries over the board.
  2. Mark the distance between edges of the batteries and their width on the PCB board. (If the PCB board is big, you can easily cut in size accordingly).
  3. Unfold 8 office paper clips and using pliers cut the clips from the edges as can be seen in the image above.
  4. A total of 8 U-clips (depending on the number of batteries to be charged) are to be made.
  5. Insert the U-clips on the PCB board such that the batteries can be inserted between the clips.
  6. The clips will act as the battery holders.
  7. Also, use the remaining portion from the clips to make the side railings.
  8. Solder the clips on the PCB board really well, as shown in the image. Note: Make sure that the clips don't get connected to eachother while soldering.

Step 4: Add the Components

  1. Place a TP4056 charging module on the PCB board as shown in the image above.
  2. Using a marker, mark the holes of the module on the PCB board.
  3. Solder a header pin in each of the marked holes.
  4. Insert the module over the header pins and solder the module carefully.
  5. Use the number of modules equal to the number of batteries to be charged i.e one module per battery.
  6. Solder all the modules on the PCB board as shown in the image.
  7. Take PCB switches and solder a switch between every module on the PCB board.
Note: Make sure to refer to the images in order to avoid any errors.

Step 5: Connect the Components

  1. Refer to the connection layout above and solder all the components together.
  2. Make sure to mark the polarity on the battery holder made of U-clips.
  3. Connect the battery holder terminals to the input terminals of the TP4056 charging module according to the polarity.
  4. Connect the modules together such that they can input power from a single wall charger.
  5. Also, make connections between the switches such that they can be used to independently control the power to the modules.

Step 6: Test the Battery Charger

  1. Insert the batteries in the battery holder over the PCB board.
  2. Connect a mobile phone charger to one of the module and switch ON the supply.
  3. An indicator will glow on the module to indicate charging.
  4. Use the switches to control the power supplied to the batteries.
  5. Turn all the switches OFF if you want to charge only a single battery.
  6. Turn ON the switches with respect to the number of batteries charging at a certain time.
  7. Since each battery has a separate charger, so they will never face the problem of overcharging and under charging (most common problem that damages Li-ion cells)
Note: A TP4056 charging module is capable to provide 1A at 5v. Since, i have made a 4 battery charger, so it is essential to use a 2A mobile charger, such that atleast 500mA are provide to each cell.

So Friends, this here concludes the tutorial, make one yourself at home and use any number of lithium ion cells without worrying about charging them. Stay tuned and SUBSCRIBE to receive regular updates. Also, Don't forget to leave your feedback and suggestions in the comment section below.

Thanks For your support..!!



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    4 Questions


    Will this work on any size 1.5V battery e.g. D, C, AA, AAA?

    Definitely not, the TP4056 charging module circuit is specifically designed for dealing with 18650 3.7v Li-Ion Battery. IMHO using it to try and charge other battery types can be dangerous.

    I see the charger is rated for 5 volts - would it it try to charge these batteries to same?


    Could this not charge 5 batteries or 6?


    This is totally scalable. The only limitation is the input current your source provides.

    if the charger modules turn themselves off when they are finished, why do you need the switches? surely the boards could just be wired in parallel?

    Yes, its true that the charger modules cut off supply current themselves when the battery is charged but there are times when you only need to charge one or two cells, the switches are then used to completely turn OFF the remaining unused modules.


    you have a neat layout on the PCB. I have been using battery holders to do that job just for convenience and ease of use. They are available in different sizes and are cheap. Your PCB could be stuck on the back with the regulator chip to make the whole unit smaller. I have used them to replace cells in cordless tools and convert old dead Ni-cad tools to 18650 Li-ion cells.

    1234x 18650 holder.jpg4x 18650 holder.jpg

    Could you show us an instructable to add charging power thru a small solar panel or wind turbine?

    Yes, that seems like a good idea, will give it a try when i find some extra time.

    The base module you are using is unfortunately not very reliable nor clever at all. So this is an ok cheap solution, but in no way compareable to a proper 50+$ lipo charger.

    I was looking for a better solution based on your comment. What about MP1405 modules? They seem to be a TP4056 with better battery protection. Is there another module that is better for this type of application?

    Yes, it can't be compared to the commercial products but it does my work to charge the old 18650 cells for my projects and can only be made in around $9.



    I really like your method of "PCB" construction. I'm going to have to build one of these too.

    Very impressive! IMHO Another way to balance the batteries is to use one module for charging and .close contacts of vacant batteries. So you you can use your buttons just to close contacts. It will be cheaper and more useful as you really balanced the batteries.

    Thank you for nice idea.

    Please advise the analog of TP4056 to charge LiFePo 18650 batteries.