I have an iphone 3g it is showing problems its jailbroken and battery is draining too fast?

Its like draining 67% yo straight 49% in 3 minutes, it was never like that before i need a solution please help i have turned the push notifications and the brightness to lower i don't use 3g the draining speed slowed a bit but still its not that good somebody please help me.

Simply put - you need to upgrade. And soon. The first sign of your phone "getting tired" is the battery not holding a complete charge the way it used to. This happens over time because over the lifetime of the device, we're constantly plugging and unplugging it from the same charger and basically overusing them both. That being said, if you can't afford to upgrade at this time, you can try several techniques to avoid the battery drainage. Having the phone Jailbroken can significantly impact your phone in many ways including killing the battery. There's a way to go back and fix that however. You can reset the device to factory settings and everything will start off as basically brand new. Definitely try those techniques and maybe download an app that will help with conserving power but the answer still stands… You're using a device that is basically obsolete and you need to get an upgrade soon.