Panasonic CF-73 Series Reference Manual page 35

Battery Power
35
About High Temperature Mode
This computer has a high temperature mode function that prevents the degradation of the
battery in high temperature environments. We recommend setting the high temperature
mode function when installing the computer in a car, etc.
To use the high temperature mode function, set [Environment] in the [Main] menu of the
Setup Utility to [High Temperature].
Note that a level of 100% in the [High Temperature] mode is about a level of 80% in the
[Normal Temperature] mode.
After switching from [Normal Temperature] to [High Temperature], or vice versa, the
remaining battery will not be displayed properly until the battery pack is completely
discharged or fully charged.