PSP Power Controller by SnyFbSx allows to set various options on your PSP.

Changes:

Bug fix: The battery remainder amount time display cannot be corrected.
The display form at operating time was changed.
Changed to display Celsius and Fahrenheit temperature battery.
*The main display of temperature changes for each language.
It was displayed by a part of “Game” and “Homebrew”.
*The screen may flicker and more.

http://wololo.net/talk/viewtopic.php?f=26&t=5739