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Difference between primary and secondary cells

Differentiate between primary and secondary cells.

Answers(3)

Answer

Janhavi Govinda rao

Member since Feb 20, 2013

  • A primary cell cannot be recharged whereas a secondary cell can be recharged.
  • In a primary cell chemical reaction is irreversible whereas in a secondary cell chemical reaction is reversible.
  • The internal resistance is high for a primary cell whereas it is low for a secondary cell.
  • In a primary cell, chemical energy is converted into electrical energy when current is drawn from it whereas in a secondary cell electrical energy is converted into chemical energy when current is passed through it and chemical energy is converted into electrical energy when current is drawn from it.
  •  A primary cell is light and  less expensive whereas  a secondary cell is heavy and expensive.

Syeda

Member since Jan 25, 2017

Answer.

A primary cell cannot be recharged whereas a secondary cell can be recharged.
In a primary cell chemical reaction is irreversible whereas in a secondary cell chemical reaction is reversible.
The internal resistance is high for a primary cell whereas it is low for a secondary cell.
In a primary cell, chemical energy is converted into electrical energy when current is drawn from it whereas in a secondary cell electrical energy is converted into chemical energy when current is passed through it and chemical energy is converted into electrical energy when current is drawn from it.
 A primary cell is light and  less expensive whereas  a secondary cell is heavy and expensive.

Shankur Srivastava

Primary Cell Secondary Cell
Lower initial cost. Higher Initial Cost
Higher life-cycle cost ($/kWh). Lower life-cycle cost ($/kWh) if charging in convenient and inexpensive
Disposable. Regular maintenance required.
Disposable. Periodic recharging required.
Replacement readily available. Replacements while available, are not produced in the same sheer numbers as primary batteries. May need to be pre-ordered.
Typically lighter and smaller  thus traditionally more suited for portable applications.

Traditionally less suited for portable applications, although recent advances in Lithium battery technology have lead to the development of smaller/lighter secondary batteries.

Longer service per charge and good Relative to primary battery systems, traditional secondary batteries (particularly aqueous secondary batteries) exhibit inferior charge retention.
Not ideally suited for heavy load/high rate discharge high performance. Superior high discharge rate performance at heavy loads
Not ideally suited for , emergency backup, hybrid battery, and high cost military applications. Ideally suited for load-leveling, emergency backup, hybrid battery and high cost military applications
Traditionally limited to specific applications.                                                                  The overall inherent versatility of secondary battery systems allows its use and continuing research for a large spectrum of applications.
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