Has anyone else noticed that the installation of TeleNav kills their battery life? I've installed it and uninstalled it twice. When it was installed, my battery went from 95% at night to 50% by the morning...

Are you running the Telenav all night or shutting it down? If you are a heavy user I would recommend one of the extended batteries by Seidio.
Seidioonline.com

Ummmm...whats Telnav???....and where can I get it?

Are you driving all night. Yes it kills the battery when in heavy use. Need a car adapter for sure.

Mos Def, unless I am checking something quickly I have it (my BB) plugged in to the car. It also uses a lot of data so better to have the unlimited BB plan.