There are some apps that run all the time and can drain your battery.
Double click the Home button on the IPad. Icons for all of the apps that you recently used will appear across the bottom of the screen. These apps are still running in the background and using up battery life.Just click on the minus button to delete the icon. You are NOT deleting the app, just the icon.
Here are some other tips to save on battery life.
5 tips to fix your iPhone and iPad battery life problems on iOS 7.1! | Best of the Web