Can I prevent my S6 from reducing brightness at 5% battery?

My Samsung Galaxy S6 with Android 6.0.1 always dims the screen when hitting 5% remaining battery. This is very bad in bright sunlight because the screen gets so dark that it's impossible to use the phone and pure guesswork to brighten it again. This “feature“ seems to override both auto and manual brightness setting. It also happens irrespective of power saving mode on/off. How can I stop it from doing this?