|When you removed the battery you lost the bios settings, although it should have defaulted to a basic setting that would recognize your hard drive. But as already mentioned, check the bios settings. Make sure the hard drive is seen. Set the date correctly too. The date would have defaulted to it's creation date and that can cause a message telling you to configure the bios settings.|
Also possible is while you were inside the case changing the battery you loosened the hard drive cable or did some other unintentional damage.