Patent ID: 6918645

Claim:
A printer comprising: a printing section for performing printing on paper; a paper feed section for transferring paper, which is fed from a paper feed cassette, to said printing section; a battery power source; a remaining-battery-capacity detector for detecting a remaining-battery-capacity level of said battery power source; a print-operation-commencement specifying section for specifying print-operation commencement; a power-on specifying section for specifying power-on of the printer; and control section for performing print-operation control wherein said control section determines whether a paper transfer operation of, and a print operation on, at least one sheet of paper are possible when the remaining-battery-capacity detector has detected a remaining-battery-capacity level at a first time corresponding to a specification of power-on of the printer by the power-on specifying section, and subsequently, after the print-operation-commencement specifying section has specified print-operation commencement, performs the print-operation control such that said remaining-battery-capacity detector is used to detect the remaining battery capacity level immediately before a paper transfer operation is commenced for the first sheet of the paper for a print operation which is commenced corresponding to a print-operation commencement specification received from said print-operation-commencement specifying section, and performs the print-operation control such that when printing is consecutively performed on a plurality of sheets of the paper corresponding to said print-operation commencement specification, said remaining-battery-capacity detector is used to detect the remaining battery capacity level immediately before the paper transfer operation is performed for the print operation for each of the plurality of sheets of the paper.