● Similarities

1. Both the electrical components can generate potential difference across another electrical component.

2. Both are used to store energy which can be tapped by connecting them in a closed circuit.

● Differences

1. Definition

Battery stores electrical energy in the form of chemical energy, whereas a capacitor stores it in the form of magnetic field.

2. Size

Batteries are smaller in size compared to capacitors.

3. Function

Capacitors draw energy from the circuit, store and then release the energy. Batteries provide energy to the circuit.

4. Voltage

Batteries provide a relatively constant voltage when discharging, whereas discharging voltage gets rapidly decreased for capacitors.

5. Cell voltage

1. The cell voltage of a capacitor is 2.3 to 2.75 volts.

2. Battery cell voltage is 3.6 to 3.7 volts.

6. Charging and discharging time

Charging and discharging is fast as compared to batteries. It is about 1-10 seconds, whereas charging time of the battery varies 10-60 minutes.

7. Usage

A battery is usually a DC component, whereas capacitor is mostly used for AC applications. It is used to block DC components in circuits.

8. Service life

The service life of a capacitor is about 10 to 15 years, the one of the battery is 5 to 10 years.

9. Cost

Batteries cost less.

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