Panasonic Toughbook CF-31GT2AX2M Reference Manual page 27

Battery Power
27
NOTE
Note that a level corresponding to a 100% charge for high temperature mode is approximately equivalent to an 80%
charge level for normal temperature mode.
After switching from [Normal Temperature] to [High Temperature] or vice versa, the remaining battery capacity will not
be displayed correctly until the battery pack is completely discharged or fully charged.
In the [Auto] mode:
Once the computer has automatically switched from the normal temperature mode to the high temperature mode, the
computer will not switch back to the normal temperature mode until the battery has been used and recharged to a total
charge level of about 5 times as much as that of the fully-charged state. This is to avoid battery deterioration.