Stopping the S4 (i9505) from lowering screen brightness at 5% battery?

[Elliot B.]

I have a 7500mAh extended battery for my S4 (i9505) and even the final 5% of battery lasts for a long time.

However, the default behavior for the i9505 is to dim the screen (to the lowest setting it appears) when the battery reaches 5%.

The volume bar disappears from the notification tray and you can no longer adjust the brightness in Settings.

How can I stop this behavior?