I installed Jailbreak about a week ago on my iPod Touch and noticed right away that my battery life decreased significantly. I was getting about half the life that I did before I did the JailBreak. The reason for this is that when you open up an application it continues to constantly run in the background even after you hit the home button. More intense programs such as the NES ROMs app can really cut into your battery life.

To prevent your battery from really taking a hit after you use an application don’t just tap the hold button, hold it down for about 5 seconds and the application will quit for good. It will no longer run in the background and your battery life should last much longer.

Lonman06's Space