Will charging my iPhone battery on full brightness increase battery length?

If I adjust it to full brightness while charging and once charged 100% adjust it back to a dimmer screen will this increase the battery's life span?

No. That will make no difference.

The state the brightness is while charging, will only lengthen the time it takes to charge. It will not put more of a charge in the battery.

It has nothing to do wid battery life!
Categorically its a fake idea. Battery life has nothing to do wid dis technique…
If you wanna improve battery timing on basis of brightness do your machine a favour… Keep brightness to auto adjust mode & it will b adjusted in a minimum battery usage on its own.

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