PowerAlert Vibration is an addon based on MobileSubstrate added yesterday in Cydia that will notify you with a vibration when your phone's battery reaches 20%.
The add-on has 2 ways to alert users depending on the device used, so: if you use the add-on with an iPhone, when the battery reaches 20% you will be notified by means of a vibration and if if you use it with iPod Touch, you will be notified by means of a sound signal similar to the one that announces that the device has been successfully connected to the computer.
For those interested, the application can be downloaded for free from Cydia and I for one think that it is extremely useful, especially when you are talking on the phone, because if you are actually using the phone, the system will notify you anyway through a pop-up displayed in the middle of the screen.
