How to Built Li Ion Battery Pack !


Introduction: How to Built Li Ion Battery Pack !

About: Hi, I'm Nemeen !, Electronic and robotics enthusiastic. This is my channel 'Nematic !' I will be uploading on and about awesome Electronics Tutorials, Projects and How To´s You can always comment below...

In this project I will show you how I made this Li-Ion battery

pack using 18650 cells which can be useful to power e bike motor or a quad-copter.

So let’s get started.

Step 1: Watch the Video!

If you get bored of reading all the stuff the you can watch my video on Youtube Click Here

Step 2: Lets Start

To start with, first we have to decide the output voltage. In my case, I require 24v. As we, all know 18560 cells provide a nominal voltage of 3.7v so after a bit of calculations we will need 6 cells in series to get the output. If you want higher capacity, you can add 6 more cells in parallel to double the capacity.

Step 3: Need Some 18650's !

For this battery pack I’m using cells from Samsung you can even use Panasonic cells as well!

here are links to some good quality cells and charger

Panasonic -


Samsung(Green) -

iMAX B6AC V2 6A Balance Charger -

These are affiliate links it helps and supports the show

Step 4: Check the Voltage !

Before we proceed ahead make sure all the cells have same voltage if not charge them using TP4056 or with a balance charger or else cells may end up charging each other with unhealthy amount of current.

Step 5: Sanding the Cells

To start building the battery pack first I used sand paper to make the surface rough so solder can stick to it properly after this I pre-tinned the cells. Then I used a bit of a hot glue and stuck all the cells in alternating pattern for easy soldering.

Step 6: Soldering !

For the soldering process I'm using 2.5 SQmm wire of which I made about 1 inch long pieces which will be used later-on to connect the cells in series and also do not forget to pre-tin them as well.

Then I started the soldering process, connect the anode of 1st cell to the cathode of the 2nd cell until you are done and you will en up with two unsoldered terminals which will be your output terminals where I soldered the XT60 plug which I made earlier

Step 7: Balance Connector !

Since this is a multiple cell battery pack balance charging is mandatory so I used a 6 cell balance connector to connect each individual cell as shower in the pics

The left most pin is the GND andevery next pin will be a multiple of 3.7 v i.e. it will connect to next cell

and whooo battery pack is complete !

Step 8: Thank You !

If you like my work

Feel free to check out my YouTube channel for more awesome stuff:

You can also follow me on Facebook, Twitter etc for upcoming projects and behind the scenes information



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