I have my macbook pro for a while now and all of sudden it just started shutting down randomly when my battery had enough life in it and only works and comes back on when I put it on the charger. Do I need to replace my battery?

I have a MacBook Pro
Keeps completely shutting down all the time when its fully charged and at random times when it is at 65% for example
Do I need to get a battery replacement? Or do I have a virus?
PLEASE HELP

Sudden power-down is most often caused by overheating. The fans in a Mac are controlled by software that measures temperatures at several points inside the computer, and increases the fan speeds when temperatures are rising. You should get it checked to be sure the fans  are working as expected. Your appointment for an evaluation at the genius Bar at an Apple Store is free, in warranty or out.
Battery shortage will generally cause your MacBook to warn you, then go to sleep.
Your symptoms do not correspond with any know Viruses.

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