way to save your battery iPhone 4

i think the way is first if you install any software that effect with the system like springboard or any other soft exp like keeping or made any change in wifi system or sound or to the system in general that is all effect the battery even if you check you will find ites closed but true ites still running but you cant see if you have any program for task list you will find the prosseser down check it and you will found some still running any way you have to be smart if you install any soft that effect the system check the battery life after you install it if you find that the battery going down not as normal remove this soft and check back your battery life again and see does this soft effect your battery or not
i hope that will be uesfull
thanks
amilo pro nil