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You can run the TI-57 internally with a 9v battery but NOT the TI-59, you'll fry it. I used a 3 AAA battery pack used for a Tomy baby alarm as a replacement pack. If you have an Elektronika MK-61 calculator, it's power supply will run the TI-59.The major difference is the 59 has a built in card reader.Denny
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