what is the difference between primary battery and secondary battery

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Secondary batteries are rechargeable, primary batteries are not.

But if you had done a 5-second google search, you would know this yourself.
 

A primary cell or battery is one that cannot easily be recharged after one use, and are discarded following discharge. Most primary cells utilize electrolytes that are contained within absorbent material or a separator (i.e. no free or liquid electrolyte), and are thus termed dry cells.


A secondary cell or battery is one that can be electrically recharged after use to their original pre-discharge condition, by passing current through the circuit in the opposite direction to the current during discharge. The following graphic evidences the recharging process:




https://depts.washington.edu/matseed/batteries/MSE/classification.html
https://en.wikipedia.org/wiki/Battery_(electricity)
https://en.wikipedia.org/wiki/Primary_cell
https://en.wikipedia.org/wiki/List_of_battery_types
 
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