Hi, I just got a new ipad air, but I have noticed that my ipad 's battery drains even if I don't use it.

I would not expect a new iPad to drain to low charge warning if sitting overnight. That level of idle discharge for a new device seems very excessive to me.

If you purchased from Apple in the USA , you have a 14 day unconditional return period which you can use for a full refund or exchange. Other stores, or Apple in other countries may have different policies for returns.

You also have a one year limited warranty so can also get it checked out under warranty.

Before you do anything though, go to settings, general, background app refresh and check if you have left some App open and allowed to run in the background all night. Things like navigation or map apps, if allowed to continue running in the background (and using location services at the same time), could easily deplete a battery overnight.

You can go to an Apple Store for assistance.

But first you can try to restart the iPad and see if it works.

You can also try to turn off the background refresh of apps, because it consumes energy.

Unless they are turned off, iOS devices are always doing something. Best practice is to put them on to charge overnight. Then they are fully charged and ready to go in the morning (and back up if you have them set to automatically back up to iCloud!)

See also:

Batteries - Maximizing Performance - Apple