typically the jailbreak tool itself does not cause battery drain. it is notorious that the jailbroken apps and tweaks we put on afterwards can cause battery drain
when i originally went to 5.1.1 i just did a simple update and noticed very little improvement. then i decided to a Restore as New Phone which made a significant improvement with battery performance
then came along the Absinthe jailbreak, which had me wondering how my battery performance would take a hit with my jailbreak setup. i am happy to say, SO FAR SO GOOD! but i am also one of those people who will get rid of a jailbreak once i see it affecting battery and overall usage.. we'll see how it goes
when i originally went to 5.1.1 i just did a simple update and noticed very little improvement. then i decided to a Restore as New Phone which made a significant improvement with battery performance
then came along the Absinthe jailbreak, which had me wondering how my battery performance would take a hit with my jailbreak setup. i am happy to say, SO FAR SO GOOD! but i am also one of those people who will get rid of a jailbreak once i see it affecting battery and overall usage.. we'll see how it goes