NAiS GT10 Technical Manual page 36

Specifications
1.2 GT10 Names and Functions of Parts
CAUTION
SRAM backup by the secondary battery
When the unit is shipped, the No. 1 operation mode setting switch is set
to the "OFF" psosition, in order to prevent excessive discharging of the
secondary battery. Before using the unit, turn on the No. 1 operation
mode setting switch on the back of the main unit, to turn on the SRAM
backup function of the secondary battery. For detailed information on
the secondary battery, please see page 147, "What the Internal
Secondary Battery Does".
8
GT10/GT30