Help with TI-89 Titanium

goonboy589

I've had my TI for about 1.5 years now and a couple months ago it started to drain the batteries at a frantic pace. I make sure to turn off the calculator and it still runs through a set of four batteries in less than a week, and this is with minimal use (about 1 hour each day). I even replaced the backup battery and still no luck. Has anyone had this problem before / knows what I can do to fix it? If not i'll contact TI, but hopefully there's a quick fix