Wrong Full Charge Battery Capacity in Windows 11

[Denian2011]

Hello,

since today my HP Zbook Power got a wrong Full Charge Capacity in Windows 11. The Capacity is only 9% but the Notebook was on power since friday. I made a batteryreport and this shows the folling informations:

Battery report

COMPUTER NAME	W5CD4xxxxx
SYSTEM PRODUCT NAME	HP HP ZBook Power 15.6 inch G10 Mobile Workstation PC
BIOS	V97 Ver. 01.09.00 04/14/2025
OS BUILD	22621.1.amd64fre.ni_release.220506-1250
PLATFORM ROLE	Mobile
CONNECTED STANDBY	Supported
REPORT TIME	2025-08-0412:05:57

Installed batteries

Information about each currently installed battery

	BATTERY 1
NAME	Primary
MANUFACTURER	Hewlett-Packard
SERIAL NUMBER	018xx 2023/12/14
CHEMISTRY	LIon
DESIGN CAPACITY	83.028 mWh
FULL CHARGE CAPACITY	758.895 mWh
CYCLE COUNT	20

Recent usage

Power states over the last 3 days

START TIME	STATE	SOURCE	CAPACITY REMAINING
2025-08-0115:57:00	Active	AC	100 %	66.110 mWh
16:39:00	Suspended		100 %	66.110 mWh
2025-08-0408:53:44	Active	AC	9 %	65.843 mWh
09:02:48	Active	Battery	9 %	65.600 mWh
09:02:50	Active	AC	9 %	65.589 mWh

If I calculate it correct the design capacity is only 9.4% of the wrong full charge capacity.
I did a diagnosic run with the HP PC Diagnostics Windows and the Battery check passes. 

Log Data

Primary_designCapacity: 7170,
Primary_fullChargeCapacity: 6024,
Primary_remainingCapacity: 5251,
Primary_maxError: 2,
Primary_cycleCount: 20,

The Bios Diagnostics shows the same:
Design capacity: 83.92 Whr

Full charge capacity: 69.75 Whr (this is the capacity I got the notebook)
Actual capacity 55.22 (79%) 

The Bios is actual, I deinstalled the battery driver in the device manager but this changed nothing. 
Did someone have an idea for this problem?

UPDATE: A colleage of me got the same problem. 

[Vjx]

Hello Denian2011 ,

Thank you for reaching out. Regarding your query on Wrong Full Charge Battery Capacity in Windows 11 that you’re experiencing.

Kindly review the instructions as below :

- We at HP do not encourage using 3rd party accessories or devices , hardware upgrades unless advised in any form of hp documentation

- Find all relevant guides and drivers from the support page here on best effort basis with the limited details that we have about the device  -

https://support.hp.com/gb-en/document/ish_4449597-3519507-16

https://support.hp.com/in-en/help/computer/battery-adapter-issues

Please perform below shown steps to resolve the issue:

Step 01. Click on the Start Button

Step 02. Type "Device Manager" in the start search box & open the Device Manager

Step 03. Look for Batteries and expand it by click on the + symbol on the left

Step 04. Right Click on "Microsoft ACPI Compliant Control Method Battery" & uninstall

Note: This Battery driver will get re-installed automatically when you restart the Notebook again

Step 05. Please Shutdown the Notebook

Step 06. Please remove the Battery and unplug the Power Adapter

Step 07. Press and Hold the Power Button for full 1 Minute

Step 08. Go ahead and put back the Battery and connect the Power Adapter

Step 09. Look for "Plugged In Charging" message on the Battery icon

After performing all the steps if you are facing the same issue still, please perform three more steps:

1. Run a Battery Check in HP Support Assistant[Install the Software if it's not available]

Note: Replace the Battery If Health Check Status shows Replace

2. Update the latest BIOS for your Notebook from HP Support Site

3. Please check your Notebook with a known good Power Adapter & Battery from a different Notebook 

Note: If a known good battery is also not charging we need to replace the system board

How to improve the life of a Battery:

1. It is not advisable to use the Notebook when the Power Adapter is connected

2. It is not advisable to keep the Power Adapter plugged in even after the Battery is fully charged

3. You need to let the battery drain completely before charging again

4. Power Plan should be set correctly for extended battery life

5. Please keep the Screen Brightness at lower level

6. Please turn OFF Wi-Fi Connection when not in use

7. Please remove the CD/DVD's from the Optical Drive when not in use

Testing and Calibrating the Battery ( Windows )

Battery and Adapter Issues 

HP Computer & Laptop Diagnostic Tools 

This will help us narrow down the cause and suggest the best fix