Texas Instruments 83CML/ILI/U Guidebook - Page 417

Replacing the Batteries To replace the batteries, follow these steps. 1. Turn off the calculator. Replace the slide cover over the keyboard to avoid inadvertently turning on the calculator. Turn the back of the calculator toward you. 2. Hold the calculator upright. Place your thumb on the oval indentation on the battery cover. Push down and toward you to slide the cover about ¼ inch (6 mm). Lift off the cover to expose the battery compartment. Note: To avoid loss of information stored in memory, you must turn off the calculator. Do not remove the AAA batteries and the lithium battery simultaneously. 3. Replace all four AAA alkaline batteries at the same time. Or, replace the lithium battery. • To replace the AAA alkaline batteries, remove all four discharged AAA batteries and install new ones according to the polarity (+ and N) diagrams in the battery compartment. • To remove the lithium battery, place your index finger on the battery. Insert the tip of a ball-point pen (or similar instrument) under the battery at the small opening provided in the battery compartment. Carefully pry the battery upward, holding it with your thumb and finger. (There is a spring that pushes against the underside of the battery.) • Install the new battery, + side up, by inserting the battery and gently snapping it in with your finger. Use a CR1616 or CR1620 (or equivalent) lithium battery. 4. Replace the battery compartment cover. Turn the calculator on and adjust the display contrast, if necessary (step 1; page B.4). General Information B-3