Both of the batteries I bought check out according to the expiry dates. 2015 or something for each of them. I have no doubt in my mind that there is a problem with the camera. It was not a bad battery to begin with...
That is a good question on the battery check current draw!!! I did not think of that.
Okay, measured it with both the camera in "A" and "L" mode with the battery test button depressed. When in L (off) mode, there is no current draw as expected - in A (on) mode, it draws 57mA of current. That's almost double what it draws when metering. That seems like a nominal current draw to me though, no? I really have nothing to compare it to. I would think a short would show ~250mA (which is what the battery alone and shorted tests as).
@ John - thank you for that information. Now we're getting somewhere! I am going to follow your guide and pull it apart tomorrow after school if I can't think of anything else before then.
Again, thanks for all the responses guys. Your advice is greatly appreciated!