I have an iPhone 4s i had approx 25 apps "some free some paid" on Wednesday my phone battery started dropping fast from 95% (at 7:00am) to 30% (at 4:00pm) and I'd only sent 2-3 texts .. It was full charged again by 7:00ish and before midnight it was back down to 65% so I plugged it into the comp and removed all the apps ... It's been fine since , after 1 1/2 days it is still at 73% .. I want to re-install the apps but was wondering if there was an app "i'd prefer a free one" that would monitor which app/s are running and how much power is being used...