Intermec PB22 User Manual page 16

Chapter 1 — Using the PB22/PB32 Mobile Label and Receipt Printer
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2 Insert the battery with the tab facing away from the front control
panel.
3 Insert the edge of the battery under the lip of the PB22/PB32 and
then push down until you hear the battery latch click.
PB22/PB32 Mobile Label and Receipt Printer User's Guide