OK, what's going on now then lol...
Before Siri stopped working the battery life was amazing, even with EVERYTHING being used on and off throughout the day. The day before I was about to take it to an Apple store for some answers, Siri started working again. But now the battery life is abysmal! I've not touched any of the settings as I wanted Apple to see it as is. This phone is starting to become a lot more hassle than I'd bargained for, glad I kept my Desire HD, as good as Siri is, when working, the 4s is very close to being returned.