Alum Vs Epsom Salt Battery: What You Need To Know

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The Basics of Alum and Epsom Salt

Alum and Epsom salt are two commonly used chemicals that can be used to create homemade batteries. Alum is a chemical compound made of aluminum, potassium, sulfur, and oxygen, while Epsom salt is a compound made of magnesium, sulfur, and oxygen. Both of these compounds are readily available and can be purchased at most hardware and home improvement stores.

The Construction of Alum and Epsom Salt Batteries

Alum and Epsom salt batteries are constructed in much the same way. They both require two electrodes, one made of zinc and one made of copper, and a solution made of either alum or Epsom salt dissolved in water. When the electrodes are placed in the solution, a chemical reaction occurs, which produces a flow of electrons between the electrodes, creating a small electrical current.

The Benefits of Alum Batteries

One of the main benefits of using alum batteries is that they are relatively easy to construct and can be made with readily available materials. Alum batteries can also produce a higher voltage than Epsom salt batteries, making them a better choice for certain applications. Additionally, alum batteries tend to last longer than Epsom salt batteries, making them a more reliable source of power.

The Benefits of Epsom Salt Batteries

Epsom salt batteries are a good choice for those who are looking for a more environmentally friendly option. Epsom salt is a natural compound that is non-toxic and biodegradable, making it a safer choice for the environment. Epsom salt batteries are also less expensive than alum batteries, making them a good choice for those on a budget.

The Uses of Alum and Epsom Salt Batteries

Alum and Epsom salt batteries can be used for a variety of applications, including powering small electronic devices like calculators, clocks, and LED lights. They can also be used to power small motors and other low-powered electrical devices.

Tips for Building Your Own Alum or Epsom Salt Battery

When building your own alum or Epsom salt battery, it is important to follow the instructions carefully and use the proper materials. Always wear protective gear, such as gloves and eye protection, when handling chemicals, and dispose of any leftover chemicals properly. Additionally, be sure to test your battery before using it to power any devices.


Whether you choose to use alum or Epsom salt for your homemade battery, both options can provide a reliable source of power for a variety of applications. Consider your specific needs and budget when choosing which type of battery to build, and always follow proper safety precautions when handling chemicals.