North Star 5042373 Owner's Manual page 22

Operation – Preparing the Sprayer for Each Use
e. Slide the battery pack into the battery box until it reaches the back of
the battery box. The front of the battery pack should be resting on the
bottom of the battery box just inside the door.
f. Remove the power plug cover and use the power plug handle to insert
the power plug into the receptacle mounted inside the battery box.
Power Plug
g. Close and latch the battery box door.
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