Why Getac f110 battery meter does not match the actual operating time?

The actual operating time can be different from the estimated time, depending on how you are using the Tablet PC. If the actual operating time is much less than the estimated time, initialize the battery.

You may also find your Getac f110 battery does not charge (Battery Charge indicator does not light amber). Here tells you how to identify the problem.
Make sure that the AC adapter is properly connected.
Make sure that the battery is not too hot or cold. Allow time for thebattery pack to return to room temperature.
If the battery doesn't charge after it has been stored in very low temperatures, try disconnecting and reconnecting the AC adapter to solve the problem.
Make sure that the battery pack is installed correctly.
Make sure that the battery terminals are clean.

Source from manual.

Getac f110 battery

Also if you prefer to replace getac f110 11.4V 2100mAh laptop battery, we got this covered and here is the detail:

Voltage: 11.4V
Capacity: 2100mAh (24Wh)
Battery cells: 3-cell
Chemical: Li-ion
Battery Color: black
Condition: new original battery
Warranty: 9 months