Have you tried the battery replacement guide? If this is not the solution, then you might have put int the wrong set of batteries. Try to take out the battery without damaging any component of the camera.

If you haven't already, check our troubleshooting guide. Canon EOS Rebel T1i Troubleshooting If the troubleshooting is not effective, then you might have a broken camera. Sorry!

If you follow the Grip replacement guide, you can install a brand new grip. You can buy the rubber grip here: http://www.ebay.com/itm/like/33094183177...