Lennox Hearth PB42 - Manual (Page 17)

PB42 Portable Receipt Printer User’s Guide 17
2 Insert batteries into the two battery slots until they lock in
place. The contact side of the battery faces the back of the
printer. The printer plays the Power sound when you insert
the battery completely.
Batteries
Battery
cover
3 Close the battery cover by pulling the battery cover latch
toward the front of the printer and pushing down.