there was heavy battery leakage on this ti-83 plus silver edition (in a few places but mostly battery contacts) which I mistakenly removed by a light sanding, also removing the gold layer.
Texas Instruments TI-83 Plus Graphing calculator. No battery cover | eBay
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Texas Instruments TI-83 Plus Graphing Calculator
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DATAMATH PICTURES
TI-83 series - Wikipedia
my old used ti 83 showed this after putting new batteries in. Is this fixable? : r/calculators
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The Richfiles: TI-83 Turbo Page
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Restored Clear Blue TI 83 Plus Graphing Calculator with Slide Cover and Battery Cover (Refurbished) - Walmart.com