Battery-care global website Lithium-Ion Battery Routine Maintenance and Care for TI Graphing Calculators-->
Lithium-ion batteries have a limited life, which is affected by several factors: environment, ... https://education.ti.com/en/product-resources/battery-care
...e Based on your selection(s), the following are the latest updates available. Note: Downgrading to a previous operating system is not possible. TI-84 Plus CE family graphing calculator updates
... https://education.ti.com/en/software/update/84-ce-software-update/84ce-download
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