If you are careful with it you might make it last still longer. After changing batteries the calculator usually dims the screen so that you are not able to see much. To increase the contrast, press [2nd] key and release it. Then press the UpArrow and maintain pressure until the screen darkens to your liking. While pressing the UpArrow you might see at the top right corner the numbers changing (2, 3, 4 etc.)
If this procedure is unsuccessful, you might want to take a look at the electrical terminals (battery) and see if there are any traces of corrosion due to an acid leak from the old batteries. The terminals should be clean.
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