iPod Touch (5th Gen) Battery Won't Hold Charge

After the last update my iPod Touch 5th Gen will not hold a charge. I haven't had any problems with it until this 8.1.1 update. Yesterday I charged the battery up to full charge and used it briefly to listen to music in my car however here it is the next day and the battery is dead again. It is NOT playing while not in my car. Meaning nothing should be running the battery down because it's not being used. I know it's not playing because the volume is set to half way so I'd undoubtedly hear it if it was playing. It just won't hold a charge and for no apparent reason. Any suggestions?