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- HP Battery Shows Incorrect Design Capacity (51Wh Instead of ...

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06-15-2025 11:48 PM
My laptop is equipped with a 4-cell 70Wh battery, and the label physically confirms this. However:
Windows battery report (powercfg /batteryreport) and all third-party tools (like BatteryInfoView and HWInfo) show a design capacity of only 51,528 mWh.
Meanwhile, the HP UEFI Diagnostics Tool correctly reports the design capacity as 70,070 mWh, which matches the battery label.
What I’ve Tried:
Disabled Adaptive Battery Optimizer in BIOS ✅
Updated BIOS to the latest version ✅
Uninstalled and reinstalled battery drivers ✅
Drained and fully recharged the battery (manual calibration) ✅
Checked with third-party tools (all report 51.5Wh) ✅
Why does HP Diagnostics correctly read 70Wh, while Windows and all other tools report only 51Wh?
Is this due to a firmware limitation set by HP's EC/BIOS, or could this be a mismatch between the battery firmware and the system firmware?
If the battery truly is 70Wh (as Diagnostics confirms), I would like the full capacity to be properly exposed to the operating system. Is there any official way (BIOS update, firmware patch, replacement) to correct this?