iPhone users had been complaining about battery drain problem in the iPhone 4S or iOS 5, and Apple seem still failed to fix the issue.
A tweak named "Battery Fix For iOS 5" was released on Cydia for a price of US$4.99, and everyone had been circling over the internet about this tweak in the past few days. However, according to recent news, this tweak is in fact a scam.
Read more here: http://www.ijailbreak.com/cydia/ios-5-battery-fix-cydia-tweak-scam/