If I update my iPhone's iOS, will it cause my batteries to drain faster, slow, or the same?

If I update my iPhone's iOS, will it cause my batteries to drain faster, slow, or the same?

The same. The upgrades usually have nothing to do with the battery

About the same.

Faster during the update,
then about the same as before when you use it.

You could connect the charger for the update
to keep the battery from being affected at all.

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