This guide shows you how to replace the backup battery on the TI-84 Plus Silver Edition. The backup battery is located on the back side of the calculator above the main batteries.
Push firmly down on the tab located on the back of the calculator near the center.
Pull the tab up, lifting it off of the calculator and exposing the batteries.
Push from the positive side to the negative side and pull up to remove each battery.
Using the Phillips #00 Screwdriver, unscrew the 15 mm screw holding the backup battery cover, located above the main battery area.
Grab the plate and lift gently upward, to remove the backup battery cover.
Wedge the small plastic opening tool under the backup battery in the gap to the left of the backup battery.
Push gently downward until the backup battery pops out.