IOS7 Battery Issues

I have an iPod Touch 5th generation. I upgraded to ios7 the day that it was available to the public and did not have any battery issues. I always take care of my battery and have never overcharged it, nor have I ever dropped my iPod. Now, around yesterday and today, I noticed that something wonky was going on with the battery. It was taking it less time for it to drain from 100% to 95%, and today, after listening to music for around 15 mins, I noticed that the battery went from 50% to 40%. Then I went on the web for 10mins, and it went from 40% to 30%. After plugging in to charge my iPod right now, the charge went up to 40% immediatly. I have always used the Battery Saver app to check my battery level.

I really hope the battery hasn't died down already on me! I got my iPod around in March.