My calculator kept saying low battery every time i would turn it on, but during one of my exams it turned off and ever since it has not turned on.
I have tried charging it, when I plug it in nothing displays on the screen same for when I replaced all the AAA batteries.
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If replacing the AAA batteries doesn't work, you can try replacing the small coin-shaped backup battery in the calculator to see if it resolves the problem.
iFixit has a teardown for the calculator that may be helpful: TI-84 Plus Disassembly
Or you can reference this battery replacement guide for a similar calculator: TI-84 Plus Silver Edition Backup Battery Replacement
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