Windows OS makes use of a feature of modern laptop batteries which have circuitry and firmware that can report to Windows the overall health of the battery. This is reported in absolute terms as Watt-hours power capacity. Windows then does a simple calculation to determine a percentage of degradation from the original design capacity. The Windows 7 notification is a battery meter icon and notification with a message “Consider replacing your battery”. There have been reports that after upgrading their Windows OS, users received this message.
Consider replacing your battery
If this warning is displayed even if a new battery is inserted into the laptop, then a BIOS update may help you.
This problem occurs because of a code defect in the system firmware (BIOS) of some notebooks.
The Advanced Configuration and Power Interface (ACPI) firmware does not correctly initialize and report the Design Capacity field of the static battery information structure that is retrieved by using the _BIF method. Therefore, the Design Capacity that is reported to Windows may be much larger than the Last Full Charge capacity that is also reported in the static battery information structure.
The Windows Battery Meter divides the Last Full Charge capacity by the Design Capacity to determine battery health. The Windows Battery Meter displays the “Consider replacing your battery” message when the Last Full Charge Capacity is less than 40% of the Design Capacity. When this issue occurs, the Design Capacity is reported as much larger than Last Full Charge capacity. Therefore, the “Consider replacing your battery” message is always shown.
To resolve this problem, contact the computer manufacturer to obtain a BIOS update for your computer.