Full Charge Alert alerts you when your iPhone has finished charging so you know when you can unplug it. You can choose between several alerts: a pop-up, vibration or an alarm.
You can configure it in the iPhone settings.
You can download it by $ 1.25 on Cydia.
You need to have done the jailbreak.
I already downloaded the masturbating application. (this is what pirate apps are called in my town)