Difference Between Capacitor And Battery

Comparisons, Knowledgebase

Last Updated on November 25, 2022 by mdmtool

Capacitor and battery are use to store and release energy. They are used in different devices to provide energy quickly.

What Is A Battery?


batteryA battery is a device that stores energy and converts it into electrical energy. It consists of one or more electrochemical cells. Batteries are usually made of chemicals that react to create an electric current.

What Is A Capacitor?


A capacitor is a device that stores energy in an electric field, while a battery stores energy in a chemical reaction. Capacitors are typically made of two metal plates separated by an insulating material.

Difference Between Capacitor And Battery

what is battery

  • Size: Another difference between capacitors and batteries is that capacitors are typically smaller and lighter than batteries. This makes them easier to transport and less likely to cause damage if they are dropped or knocked over.
  • Lifespan: Capacitors typically have a shorter lifespan than batteries, meaning they will need to be replaced more often.
  • Basic design: Capacitors are made up of two electrical plates separated by an insulator, while batteries have positive and negative electrodes separated by an electrolyte.
  • How they work: Capacitors store energy in an electric field, while batteries use a chemical reaction to create an electric current.
  • Applications: Capacitors are commonly used in electronic devices such as radios, TVs, and computers. Batteries power devices such as flashlights, cell phones, and laptops. As you can see, capacitors and batteries have several key differences.
  • Usage: Capacitors are often used in applications where a quick burst of energy is needed, such as in digital cameras and flashlights. Batteries are often used in applications where a steady stream of energy is required, such as in watches and laptops.
  • Storage: Capacitors can store more energy than batteries for a given size, but they can only discharge that energy quickly. Batteries can store less energy than capacitors for a given size, but they can discharge that energy more slowly and steadily.
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What Are The Similarities Between A Battery And A Capacitor?

what is capacitor

The following are the three similarities between a battery and a capacitor:

  • Both store charge.
  • Both have a positive and negative terminal.
  • The voltage across both is determined by the difference in potential between the two terminals.

What Are The Factors That One Should Consider While Choosing A Capacitor?

There are many factors to consider when choosing a capacitor.

  • Voltage: The first is the voltage rating. This is the maximum amount of voltage that the capacitor can safely store. If the voltage is too high, the capacitor may explode.
  • Capacitance: This is the amount of charge that the capacitor can store. The higher the capacitance, the more charge the capacitor can store.
  • Leakage current: This is the amount of current that leaks out of the capacitor over time.
  • Self-discharge rate: This is the rate at which the capacitor loses its charge when unused.
  • Temperature range: Also, consider the temperature range. This is the range of temperatures at which the capacitor can safely operate.
  • Endurance: Another important factor is endurance. This is the number of times the capacitor can be charged and discharged without damaging it.
  • Stability: Stability should also be considered. This is the ability of the capacitor to maintain its capacitance over time.
  • Size: The eighth factor is size. This is the physical size of the capacitor.
  • Price: Finally, consider the price. This is the amount you are willing to spend on the capacitor.

Advantages Of Battery

  • A battery can store a lot of energy in a small space. This is important for things like cell phones and laptops, where you need a lot of power in a small package.
  • Batteries can be recharged. You can use a battery repeatedly as long as you recharge it before it runs out of power.
  • Batteries are relatively inexpensive. You can buy a good-quality battery for a few dollars.
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Advantages Of Capacitor

  • A capacitor can store more energy than a battery to power things like electric cars.
  • A capacitor can be recharged very quickly. You can restore a capacitor in seconds, which is essential for things like power tools.
  • A capacitor doesn’t contain any poisonous chemicals. This is important for the environment.


Which one stores more energy, a capacitor or a battery?

A capacitor can store more energy than a battery but can’t release it as quickly as a battery can.

How long does it take for a capacitor to discharge?

Capacitors can discharge quite quickly, depending on the type of capacitor and how it is used. Some capacitors can discharge in as little as a millisecond.


The main difference between a capacitor and a battery is that a capacitor stores energy in an electric field, while a battery stores energy in chemical reactions. While both devices can store and release electrical energy, capacitors are generally much better suited for applications where quick, high-energy discharge is required, such as in flash photography or power supplies for electronic devices. On the other hand, batteries are better suited for applications where a steady, long-term power supply is required, such as in watches or portable electronic devices.

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