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I suspected I would get a lot for funny replies. Since my calculator is a museum piece, no one ever touches it. I'm not a battery expert but the code "C8501" could it be the supposed expiry date [Jan '85]. The irony is that the manual mentioned that "the batteries that come with your calculator...

Thank you hydroman247, but still, 28 years?? Everyone else has told me that it's impossible.

In 1984 I bought a CASIO scientific calculator fx-100 which included 2 AA 1.5V alkaline Casio batteries [Casio Mabic C8501]. I have been using this calculator every single day throughout my student and professional life (total:28 years) with the SAME two batteries. I have written to CASIO asking...