State the reason you wish to close your account. If you have a copy of the EIN Assignment Notice that was issued when your EIN was assigned, you should include that when you write. Otherwise, be sure to include the complete legal name of the entity, the EIN, and the mailing address.
After all, if your iPad doesn't have any power, it doesn't work. The iPad's battery is generally pretty good, but if your battery is starting to fail, you've got a problem. You can't easily swap out a failing battery for a new one because Apple designs its products with solid cases.
If tip above does not work, try resetting your iPad. To do this, press and hold the Sleep/Wake button and the Home button at the same time until you see the Apple logo. If above tips do not work, the issue could be that the battery is fully depleted.