IPhone 4S iOS 8.1 Battery problems?

I downloaded iOS 8.1 last Saturday, no noticeable difference (still slow like iOS 8). But today, I'm experiencing battery life problems. I have been charged my phone this morning to 100% and with not much use, within 4 hours the battery drained.
For 30 minutes I have been charging in airplane mode, with no apps or anything running in the background. I turned it off and on again, it has gone from 9-20% in 30 minutes.
This isn't normal for my phone, it usually charges quick. I have a lot of space free and there's nothing wrong with the phone.
Anyone have solutions?

iPhone 4S running iOS 8.1

I regret downloading iOS 8 altogether!

A little bit

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