Remove battery from packaging. The proper replacement battery will have “LR44” printed on the top, or positive side, of the battery.

Place replacement battery, positive side facing up and visible, into the battery compartment

Apply gentle pressure until the battery lays flush with the surrounding green housing.

Note: This step will automatically turn calculator on. If the calculator is not turned on automatically, the battery may be placed incorrectly or another issue may be causing the calculator to malfunction.