Paxar Monarch series Operator's Handbook Manual page 16

♦ The printer uses battery power even when the printer is not printing.
Remove the printer's main battery and place on a charger when the
printer is not in use.
♦ If the printer does not have a main battery, connect the printer to the
Battery Backup Power.
Many factors affect your battery's performance, including the quantity of
labels printed, percentage of black per label, and power management.
2-6 Using Batteries