25Battery Powerz If you have two or more battery packs, perform the “Battery Recalibration” for each battery pack.z If the computer is turned off during the “Battery Recalibration” (e.g., due to power failure, or accidental removal of theAC adaptor and battery pack), the “Battery Recalibration” will not be completed.z You can also perform the “Battery Recalibration” with the following procedure.A Restart the computer.B Press F9 while the [Panasonic] boot screen is displayed just after the computer starts the startup procedure.C When the remaining battery power is displayed, press Enter.D Follow the on-screen instructions.The battery pack is a consumable item, and deteriorates gradually each time it is used.Use effective switching of the Economy Mode (ECO) to reduce battery pack deterioration, and enable the battery pack to lasta little longer. Switch the Economy Mode (ECO) in accordance with the way you use your computer.z Economy Mode (ECO) disabled:In the default setting, the Economy Mode (ECO) is set to “Disabled. ”Charge the battery to 100% (fully charged). We recommend that you disable the Economy Mode (ECO) if you use the bat-tery pack frequently.z Economy Mode (ECO) enabled:Stop the battery recharging at 80% of fully charged. By stopping the battery recharging before 100% (fully charged), theburden on the battery is reduced and deterioration is prevented, so the lifetime of battery pack will be extended. The com-puter will not operate as long on the battery as when Economy Mode (ECO) is disabled.If you often use the computer with the AC adaptor connected, and if you want to prevent deterioration of the battery pack,we recommend that you enable the Economy Mode (ECO).Switching between Long Battery Life and Extended OperatingTime (Economy Mode (ECO) Setting Utility)Economy Mode (ECO)Disabled EnabledRecommended usage MobileUsing your computer while on the moveDesktopAC adaptor is connected most of the timeOperation time Extended NormalLifetime of battery Normal Extended