S4BB Limited just released OutOfBattery for BlackBerry® Smartphones. You can display on your screen an empty battery with just one click.
When to use OutOfBattery
Imagine, you and your friends are at a party, and one of them asks you if he can borrow your cool BlackBerry device to make a call. The problem is that you don’t want to share your phone credit, but meanwhile, you don’t want to make yourself out to be a cheap friend… What’s the solution? Just click on a convenience key button on your BlackBerry device to display an empty battery status. Now, you can just say “Sorry bro, my device is out of battery”.
More information: OutOfBattery for BlackBerry® Smartphones