| | [* icon_caution] ***If the HP UEFI diagnostics detect a persistent inaccuracy, a calibration will be recommended - this EliteBook 640 G9 does not need it, so it was not presented to me.*** |
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| | [* black] ***In order to check the battery health on HP laptops, you MUST use the UEFI tool as HP hides the actual heath data from the operating system.*** The tool can be [https://support.hp.com/us-en/help/hp-pc-hardware-diagnostics|downloaded here|new_window=true] and written to a USB drive, or a secondary partition on the laptop - the choice is yours. |
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| | [* black] Run the HP diagnostics and do the following to access the battery test: |
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| | [* black] Locate ***Power*** in the diagnostics |
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| | [* black] Click on ***Battery*** and select ***Run once***. This will take approx 2-3 minutes. |
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| | [* black] ***NOT SHOWN HERE*** Click on ***Battery details*** to review the health data. |
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