Texas Instruments 83CML/ILI/U Guidebook - Page 416

Battery Information When to Replace the Batteries The TI.83 uses five batteries: four AAA alkaline batteries and one lithium battery. The lithium battery provides auxiliary power to retain memory while you replace the AAA batteries. When the battery voltage level drops below a usable level, the TI.83 displays this message when you turn on the unit. After this message is first displayed, you can expect the batteries to function for about one or two weeks, depending on usage. (This one-week to two-week period is based on tests with alkaline batteries; the performance of other kinds of batteries may vary.) The low-battery message continues to be displayed each time you turn on the unit until you replace the batteries. If you do not replace the batteries within about two weeks, the calculator may turn off by itself or fail to turn on until you install new batteries. Replace the lithium battery every three or four years. Effects of Replacing the Batteries Do not remove both types of batteries (AAA and lithium auxiliary) at the same time. Do not allow the batteries to lose power completely. If you follow these guidelines and the steps for replacing batteries on page B.3, you can replace either type of battery without losing any information in memory. Battery Precautions Take these precautions when replacing batteries. • Do not mix new and used batteries. Do not mix brands (or types within brands) of batteries. • Do not mix rechargeable and nonrechargeable batteries. • Install batteries according to polarity (+ and N) diagrams. • Do not place nonrechargeable batteries in a battery recharger. • Properly dispose of used batteries immediately. Do not leave them within the reach of children. • Do not incinerate batteries. B-2 General Information