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The TI-84 Plus CE is a graphing calculator released in Spring 2015 by Texas Instruments. It includes a 2.8 inch color screen, USB port, apps, storage, and a 1200 mAh battery.

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Why does my TI-84 Plus CE graphing calculator die fast?

When charging, the battery indicator on the screen stays the same at about 3/4 of the rectangle. I left it for about 5 hours and it still isn’t fully charged. When I unplug it to use it for 5 minutes, the calculator battery instantly drops to about 1/4 of the rectangle.

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As brandon k pointed out, that behavior likely means the battery is shot and you’ll need to replace it. There’s a guide to help you with that here: Texas Instruments TI-84 Plus CE Battery Replacement

Be careful because the battery may have swelled and could cause a fire if you mess with it too roughly.

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From what you described it sounds like the battery(s) need replaced.

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