HP -22S Owner's Manual page 144

4. Turn the calculator over and shake the batteries out.
Warning
Do not mutilate, puncture, or dispose of batteries in
fire. The batteries can burst or explode, releasing haz-
ardous chemicals.
5. Hold the calculator as shown and stack the batteries, one at a
time, in the battery compartment. Orient the batteries according
to the diagram inside the battery compartment. Be sure the
raised and flat ends match the diagram.
6. Insert the tab of the battery-compartment door into the slot in
the calculator case, as shown.
144 A: Assistance, Batteries, Memory, and Service