How to make a 12v battery pack at home is an easy project based on multiple Li-ion batteries in series to create a 12v pack. You have two options one is to solder the batteries and then make your connection series or parallel or mixed i have found that this 18650 battery holder works just fine and you can reuse them for other projects.
You will need eight because all together they will equal one 12V battery (1.5 × 8 = 12). You also need to purchase a battery pack kit. The kit, when assembled, will provide you with the components necessary to create your new power source. Review the assembly instructions for the battery pack.
To build a 12V battery pack with 18650 cells, connect four cells in series (3.7V each) to achieve approximately 14.8V nominal. Use appropriate battery management systems (BMS) for safety. Ensure balanced charging and consider using protective cases for safety and longevity.
To make the battery pack, you have to first finalize the nominal voltage and capacity of the pack. Either it will be in terms of Volt, mAh/ Ah, or Wh. You have to connect the cells in parallel to reach the desired capacity (mAh ) and connect such parallel group in series to achieve the nominal voltage (Volt ).
Place them in the compartment. If the battery pack has a tester light, this should turn on and appear green. This indicates that the battery pack has been properly assembled and is ready to be used. You will need to attach the 12V battery pack to the electronic device that you are planning on using it with.
Charging the Battery Pack : You can charge the battery pack by a 12.6V DC adapter like this. You can get it easily from aliexpress or eBay. Hope you enjoyed reading about my project as much as I have enjoyed building it. If you’re thinking about making your own I would encourage you to do so, you will learn a lot.