How is Battle Activity calculated?

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Battle activity is a percentage that is shown at the end of a battle.
During the winter holidays, there's a contest that, if you win 5 battles with more than 80% of activity, will let you join the CBT of the naval forces.
My question is: What is this Battle Activity? How is it calculated? How can you easily have more than 80?
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Images: Matthias Groeneveld, Pixabay, Monstera, Annushka Ahuja