The laptop stops charging at 99%, even though it is connected

[pilkarzq]

Hi. I have a problem because for about 4 hours my laptop has had the same amount of battery (99%) even though it is connected. I disconnected and turned on the power supply but it's still the same. 

[NonSequitur777]

@pilkarzq,

Welcome to our HP Community forum!

Well, it is very common for laptops to stop charging at 99% (or slightly less than 100%) when plugged in. This behavior is usually intentional and part of the laptop's battery management system. Here are some possible reasons for this:

1. Battery Health Preservation

• Modern laptops have smart charging mechanisms to extend battery lifespan. Continuously charging the battery to 100% can increase wear over time, so the system stops charging slightly below full capacity.

2. Calibration Issue

• The battery calibration may be slightly off, and the system misinterprets the battery's full charge as 99%. Recalibrating the battery might help in this case.

Steps to recalibrate:

1. Fully charge your laptop to 100%.
2. Disconnect it from the charger and use it until the battery is completely drained.
3. Let the laptop rest for a few hours.
4. Charge it back to 100% without interruptions.

3. Power Plan Settings

• Some laptops have power settings to prevent full charging. Check your system's power or battery management settings. *

• Open HP Support Assistant or BIOS and look for battery care options. There might be an "Optimized Battery Health" setting enabled.
• Make sure you got the latest BIOS and software updates: https://support.hp.com/us-en/drivers/hp-255-15.6-inch-g9-notebook-pc/2101122489.

4. Battery or Charger Issues

• If your laptop stops at 99% regardless of how long it's charging, there could be a minor issue with the battery or charger. You can:
  • Ensure you're using the original charger.
  • Update your laptop's BIOS and power management software.
  • Test with another compatible charger, if available.

5. Ambient Temperature or Hardware Protection

• Batteries are sensitive to heat. If the system detects overheating or other potential risks, it might limit charging to prevent damage.

If the issue persists or if the battery percentage gradually decreases over time while plugged in, it might be a hardware issue requiring professional inspection.

* To check and modify your HP laptop's power or battery management settings, please follow these steps:

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1. Using Windows Settings

1. Access Power & Battery Settings:
   • Press Windows + I to open Settings.
   • Navigate to System > Power & Battery (on Windows 11) or System > Power & Sleep (on Windows 10).
2. Review Power Plan Settings:
   • Click Additional power settings (usually on the right-hand side or at the bottom).
   • In the Power Options window, review or customize your active power plan.
3. Change Advanced Settings:
   • Select Change plan settings for your current plan.
   • Click Change advanced power settings to open the detailed options.
   • Expand the Battery section to review options for plugged-in behavior and low/critical battery actions.

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2. Using HP Support Assistant

1. Open HP Support Assistant:
   • Press the Windows key and type HP Support Assistant or look for it in the Start Menu.
2. Navigate to Battery Health Management:
   • In HP Support Assistant, select Battery or Battery Check under the maintenance section.
   • If available, look for settings like Battery Health Manager or similar.
   • Adjust options such as "Maximize Battery Health" or "Extend Battery Life."

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3. Checking HP BIOS Settings

If you suspect advanced battery settings are in the BIOS:

1. Enter BIOS Setup:
   • Restart your laptop and repeatedly press the F10 key (or Esc, depending on your model) during startup.
2. Locate Battery Management Settings:
   • In the BIOS menu, navigate to the Advanced or Power section.
   • Look for options like Battery Care Function or Maximized Battery Health.
3. Modify Settings:
   • Disable or enable options based on your preference.
   • Save changes and exit the BIOS.

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4. Using HP Diagnostic Tools

1. HP PC Hardware Diagnostics:
   • Restart your laptop and press F2 during startup to access diagnostics.
   • Select Component Tests > Power to run a battery check.
2. This tool might also provide additional insights into your battery's health and charging behavior.

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Let me know if you need help navigating these steps!

Kind Regards,

NonSequitur777