Battery Extender for S60

[wraggster]

Battery Extender from Ravensoft is another application that helps you extend the standby time of your S60 smartphone by up to 30% using customizable profiles which automatically disable power-hungry functions when you don't need them.

http://my-symbian.com/s60v3/software/applications.php?name=Battery_Extender&fldAuto=777&faq=1