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How to Make a 12 volt Battery: A Short and Clear Guide

A 12-volt battery is a rechargeable battery that has grown in popularity because of its many different uses. As an electronics enthusiast, your need to get knowledge and try out other projects constantly grows. Today, you get to learn about 12-volt Batteries!

In this article, we’ll cover what you need to know about the workings and how to make your homemade pack! Also, the steps of the operation are essential and simple to follow when making the battery pack.

It’s straightforward to make one yourself!

What is a Battery Pack?

A battery pack is a group of rechargeable batteries that get installed and operated together as one unit. Therefore, the number of cells dictates what voltage and amp-hour capacity the actual battery pack will have. A battery pack supplies power by boosting the voltage of multiple batteries.

Battery Pack

(Battery Pack)

2. What are the Working Principles of a 12-volt Battery?

How it works

(How it works)

A 12-volt battery is split into six cells, each with an open-circuit voltage of approximately 2 volts. As a result, this totals to about twelve volts. Connecting two batteries in series will increase their output voltage. But, batteries in series mean increased load on each cell, which is not what we want. Instead, what you should do is to parallel connect the cells. Therefore, this will decrease the load on each cell and increase your amp-hour capacity simultaneously.

Simple electric circuit

(Simple electric circuit)

A typical 12-volt battery works by converting chemical energy into electrical energy through a chemical reaction inside it. This chemical reaction occurs between zinc electrodes (the anode) and manganese dioxide (the electrolyte). Then, it creates a flow of electrons through the anode, which is what charges your battery.

The chemical reactions inside batteries are not 100% efficient, and this is because some energy is lost as heat during this process. So, it would help if you always recharged them before they become entirely discharged to avoid any damage or reduction in capacity.

3. How to Make a Simple Homemade 12-volt Battery

( Electrical bulbs and batteries)

( Electrical bulbs and batteries)

electrical components

  • 6 Lead-acid identical batteries or two 6v batteries
  • Connecting wires
  • Battery case holder or tubing
  • Electrical insulating tape.

Essential steps

Here is how to easily make your battery setups.

  • Firstly, find a casing that can hold up to six cells. Arrange the individual cells such that the negative terminal connects to the positive terminal of the other cells.
  • Also, you will need six lead-acid batteries to make up this 12V battery pack. Each one should have an output voltage of about two volts, which you want for your project. 
  • Additionally, use the same type of batteries throughout. You should jointly solder these six 2v cells. Therefore, you will have a solid connection between all of the cells in your battery pack.
Same type of batteries

( Same type of batteries)

Follow these simple steps.

  1. First, arrange the positive terminals of each cell to connect to the negative of the next cell. This should be your arrangement.
Batteries arranged on a table

(Batteries arranged on a table)

  1. Next, connect the cell holder ends using wires. You can tape the wires to each end of the first and last batteries. Remember, one should be the negative terminal wire and the other +ve terminal wire. 
Empty cell holder

(Empty cell holder)

  1. Then, take the battery cells and arrange them in the cell holder. The total voltage from the pack is 12v.
Batteries in a cell holder

(Batteries in a cell holder)

  1. You are all set to use your 12v battery! This arrangement can work with 8 1.5v and two cylindrical-shaped 6v batteries as well.
Additional tips

( Additional tips)

Important Tips.

  1. First, when using two cylindrical 6v battery cells, here’s the hack. Connect the -ve terminal of the first cell to the positive terminal of the second battery cell. You can easily do this by placing the two identical batteries in a tubing, then tightly taping them together. As a result, the output battery voltage should be 12v.
  2. Lead-acid batteries are what we call “deep cycle” batteries, and this means they can handle being completely discharged without getting damaged in their battery life. You can connect multiple cells by wiring batteries in series and parallel.
  3. Last, the storage of batteries should always be in an upright position when they’re not in use. This will prevent the electrolyte from spilling out and avoid corrosion on any of your battery’s terminals.


4. Applications of a homemade 12-volt battery pack

Here is a list of ways you can use your 12V homemade battery pack.

  • First, a 12-volt battery pack can power 12v lights and 12v appliances for camping and recreational activities.
  • Also, you can use them to power 12v smoke detectors.
  • 12-volt lead-acid battery packs application is present in 12v power tools, such as 12v drills and 12v-26 hand-held circular saws.
  • Additionally, they get used to power 12v cameras instead of using regular 12 D batteries.
  • Finally, 12-volt batteries can work well to power 12-volt winches.



We hope you’ve enjoyed learning about how to make your 12-volt battery. For more information on the subject of making a typical 12-volt battery pack, feel free to reach out to us

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Emma Lu
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