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1976 TX Instrument TI-30 Calculator w/Electric Battery BP-5 - A Piece of History | eBay
TI-30 Battery Compartment
Texas Instruments TI-30XS MultiView Scientific Calculator New Battery | eBay
How to change the battery on a TI-30XS calculator - YouTube
Texas Instruments TI30XIIS Dual Power Scientific Calculator - 2 Line(s) - LCD - Battery/Solar Powered - 6.1" x 3.2" x 0.8" - Black - 1 Each - Sierra Office Systems & Products Inc.