Texas Instruments TI86 User Manual - Page 28
Installing or Replacing Batteries, When to Replace Batteries, Operating the TI - 86 calculators
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16 Chapter 1: Operating the TI-86 To express - and 1 keystroke combinations, this guidebook places brackets ( ã and ä ) around the word above the key to press. Do not remove the lithium backup battery unless four fresh AAA batteries are in place. Properly dispose of the old batteries. If you do not use your TI-86 frequently, the AAA batteries could last more than two weeks after the first lowbattery message. Installing or Replacing Batteries Your new TI-86 includes four AAA alkaline batteries. You must install them before you can turn on the calculator. A lithium backup battery is installed in the calculator already. ᕡ If the calculator is on, turn it off (press - ) to avoid loss of information stored in memory. ᕢ Slide the protective cover over the keyboard. ᕣ Holding the calculator upright, push down on the battery cover latch, and then remove the cover. ᕤ Remove all four old batteries. ᕥ Install four new AAA alkaline batteries, arranged according to the polarity (+ and N) diagram inside the battery compartment. ᕦ Replace the battery cover by inserting the two prongs into the two slots at the bottom of the battery compartment, and then push the cover until the latch snaps closed. When to Replace Batteries When the AAA batteries are low, a low-battery message is displayed as you turn on the calculator. Generally, the calculator will continue to operate for one or two weeks after the low-battery message is first displayed. Eventually, the TI-86 will turn off automatically and will not operate until you replace the AAA batteries. The lithium backup battery is inside the battery compartment, above the AAA batteries. It retains all memory when the AAA batteries are low or have been removed. To avoid loss of data, do not remove the lithium battery unless four fresh AAA batteries are installed. Replace the lithium backup battery about every three or four years.