When your calculator's display turns on and right back off, it is time for a new battery. Replacing the battery for the TI-15 will take approximately less than 10 minutes to get you back in business. This guide will show you step-by-step the replacement for a TI-15 battery.
No parts required.
With a Y000 screwdriver, loosen the four 1mm Phillips head screws and set them aside.
With an iFixit opening tool, pry apart a total of 3 notches on the top and bottom of the calculator.
Separate the two panels to reveal the calculator's green circuit board.
Using the iFixit opening tool , slide underneath the battery cover until the battery comes out.
Remove the old battery and insert the new battery.
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