After Update iOS7 iPod Touch5 have problem with battery

My iPod Touch 5 after update to iOs7. Power of battery have problem , after charge (4-6 hour) it will be green appear on battery icon(full charge) then use it about 4-5 hour battery icon turn to red. if I chage again not more than 30 minite battery icon tune to full chage but can use not more than 1 hour.

On iOs6 battery power can use about 8-10 hour and also have problem like this.