Panasonic CF-29 Series Reference Manual page 45

Battery Power
45
NOTE
After switching from [Normal Temperature ] to [High Temperature ] or vice versa, the
remaining battery capacity will not be displayed properly until the battery pack is
completely discharged or fully charged.
In the [Auto] mode:
Once the computer has automatically switched from [Normal Temperature] to [High
Temperature], the computer will not switch back to [Normal Temperature] until the
battery has been recharged from 0% to 100% about five times. This is to prevent the
deterioration of the battery.