Updated to this earlier today and my battery life has improved immensely. Before the update, my iPhone 4s would lose 40% overnight (roughly 7-8 hours) whilst in standby. Now after 2 hours of standby, the phone is still sitting at 100% with loads of apps running in the background.
Will charge it fully tonight and see what the battery is like in the morning.
Will charge it fully tonight and see what the battery is like in the morning.