I bought the 4S in late December and stock the battery seemed fine. Then shortly thereafter the original Absinthe was released so I jailbroke... and the battery went to hell. Draining 10% each time I'd look at it. I constantly had to charge. Then one day in April it wouldn't turn on at all. I tried everything but it was dead. Luckily Apple replaced it no question asked... with 5.1 of course. No jailbreak, but the battery was amazing! Lasted all day on a charge. I figured it was an improvement with 5.1 since it was touted as having better battery performance. Now I've been jailbroken for about a week with Absinthe 2 and the battery is crap again. Maybe it's a specific app that's killing the battery. My3g? Activator? Barrel? Springtomize 2? Is there a battery app that shows what is using what? Anyone else experiencing this?