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It might be solar powered.

• andmarios 12y ago
  No, it only has an AA battery. I also have a remote control from a Sharp radio system which still works after 24 years with its original batteries! But this one is used very rarely, say 2-3 times every year.
  • logicallee 12y ago
    maybe someone else uses it too and replaced the aa battery? Maybe you replaced it but don't remember?
    • andmarios 12y ago
      No because they both have these japanese batteries that most japanese electronics come with but you can't find them anywhere in the stores. If someone had replaced them, it would be with a known brand. Besides the calculator is always on my home office and I live alone. I was very surprised too when I found out about a year ago.