HP LaserJet 3020 All-in-One Printer - Manual (Page 142)

HP LaserJet 3020/3030 all-in-one series battery
Battery material Polycarbon Monoflouride Lithium
Battery type Button or coin cell battery
Quantity per device 1
Weight Approximately 1 gram
Lithium type Solid
Battery manufacturers Rayovac of Madison, Wisconsin, USA; and
Panasonic of Secaucus, New Jersey, USA.
132 Appendix A Specifications ENWW