HP Pavilion 15-eg3 Intel Core i7 1355U Battery Not Detected Fix Windows 11

The battery on your HP Pavilion 15-eg3 Intel Core i7 1355U is not detected by Windows – Device Manager shows no battery, the laptop only runs on AC power with the battery physically present, or Windows shows plugged in not charging despite a connected adapter. EC reset and HP battery driver updates restore battery detection on the HP Pavilion 15-eg3.

This guide covers EC reset, HP Battery Health Manager, and battery driver troubleshooting for the HP Pavilion 15-eg3 Intel Core i7 1355U in Windows 11.

“HP Pavilion 15-eg3 showed no battery in Device Manager after Windows update. EC reset fixed it – held power 15 seconds with charger unplugged. Battery reappeared after reconnecting and booting. Simple fix that worked immediately.” – Norzaini, administrative officer from Selayang

Why Battery Is Not Detected on HP Pavilion 15-eg3

The HP Pavilion 15-eg3 battery is managed by the embedded controller (EC) which communicates battery status to Windows via the ACPI interface. When the EC enters an error state after a firmware update, Windows Update, or unexpected power event, it can stop reporting the battery to the ACPI subsystem – Windows then shows no battery in Device Manager and the system runs on AC power only despite the battery being physically present. EC reset drains the controller’s capacitor power and forces a fresh ACPI battery initialization on next boot, which resolves the majority of battery not detected cases without hardware repair.

• EC firmware state error causing ACPI battery reporting to stop
• Microsoft ACPI Control Method Battery driver conflict after Windows Update
• HP Battery Health Manager set to Optimized mode showing 80 percent as full charge
• Physical battery connector loose in rare cases requiring HP service

Fix 1 – EC Reset

Power off the HP Pavilion 15-eg3 completely. Disconnect the USB-C or barrel charging cable. Press and hold the power button for 15-30 seconds. Release. Reconnect the charger cable. Press power button once to start. During the power button hold with no charger, the embedded controller capacitors drain and the EC returns to default firmware state on next power-on. After boot, check Device Manager – Batteries for Microsoft ACPI-Compliant Control Method Battery entry. If the battery entry reappears without error icon, the EC reset resolved the ACPI battery enumeration issue. The taskbar battery icon should now show the battery charge percentage and charging status correctly on the HP Pavilion 15-eg3.

Fix 2 – Check HP Battery Health Manager

Open HP Support Assistant – Battery. Find HP Battery Health Manager and check the current setting. If set to Optimized, the battery charges to 80 percent maximum and then stops – this is not a fault but intentional battery longevity protection that can appear as not charging when the battery is at or above 80 percent. Set to Full to allow charging to 100 percent when maximum battery runtime is needed. The Optimized setting is designed for users who primarily use the laptop on AC power and want to extend battery lifespan by avoiding the chemical degradation that occurs from repeated charging above 80 percent on lithium-ion cells in the HP Pavilion 15-eg3.

Reinstall Battery Driver via Device Manager

Open Device Manager – Batteries. Right-click Microsoft ACPI-Compliant Control Method Battery – Uninstall device. Do not check driver deletion. Unplug the AC adapter for 5 seconds, then reconnect. Windows automatically reinstalls the ACPI battery driver. After reinstall, Device Manager should show the battery without error. Also right-click Microsoft AC Adapter – Uninstall and reconnect to reinstall the AC adapter driver. Reinstalling both battery and AC adapter ACPI devices clears driver state conflicts where Windows holds an incorrect power delivery or charge state that prevents battery percentage reporting from updating correctly on the HP Pavilion 15-eg3 Intel Core i7 1355U platform.

Fix 3 – Update HP Battery Driver via HP Support Assistant

Open HP Support Assistant and check for HP Notebook Battery Driver or HP Battery Driver updates. Install and restart. HP-specific battery driver updates for the Pavilion 15-eg3 platform include improved ACPI battery communication timing that prevents the battery from dropping off the ACPI device list during Windows power state transitions. Updated HP battery driver also improves the accuracy of battery charge percentage estimation and remaining runtime calculation for the Intel Core i7 1355U power consumption profile. After driver update, test battery detection by unplugging AC and verifying the battery percentage decreases normally in the taskbar indicator.

Fix 4 – Update HP BIOS via HP Support Assistant

Open HP Support Assistant and install BIOS updates for the HP Pavilion 15-eg3. HP BIOS updates include EC firmware components that improve battery ACPI reporting reliability. Updated EC firmware reduces the frequency of battery enumeration failures after suspend/resume cycles and Windows Update reboots by improving the EC-to-ACPI handshake timing during system power-on initialization. Install BIOS updates with the AC adapter connected and sufficient battery charge (above 20 percent). Never interrupt a BIOS update – it runs for 3-5 minutes and restarts automatically when complete. After BIOS update, battery detection stability typically improves significantly on the HP Pavilion 15-eg3 Intel Core i7 1355U platform.

Frequently Asked Questions

How do I fix battery not detected on HP Pavilion 15-eg3 Intel Core i7 1355U?

EC reset: power off, unplug charger, hold power button 30 seconds, reconnect, boot. Check Device Manager – Batteries for ACPI battery entry. HP Support Assistant BIOS update for EC firmware improvement.

Why does HP Pavilion 15-eg3 show plugged in not charging?

HP Battery Health Manager in Optimized mode limits charge to 80 percent. Change to Full in HP Support Assistant – Battery for 100 percent charging. Or ACPI driver reinstall if under 80 percent and still not charging.

Does HP Pavilion 15-eg3 Intel Core i7 1355U support battery care?

Yes – HP Battery Health Manager in HP Support Assistant. Optimized: 80 percent charge maximum for longevity. Full: 100 percent for maximum runtime when away from AC power all day.

Why does HP Pavilion 15-eg3 battery drain overnight?

Modern Standby S0 background network activity. Disable Wake on LAN and USB wake in Device Manager. Settings – System – Power – Sleep – set to longer duration or disable network access during sleep.

Conclusion

HP Pavilion 15-eg3 Intel Core i7 1355U battery not detected in Windows 11 is resolved by EC reset with 30-second power button hold after unplugging the charger, which clears the embedded controller error state causing ACPI battery enumeration failure. HP Battery Health Manager Optimized mode check explains apparent not-charging behavior at 80 percent for users unaware of the charge limit feature. ACPI battery driver reinstall via Device Manager and HP Support Assistant BIOS update with updated EC firmware provide additional fixes for persistent battery detection issues on the HP Pavilion 15-eg3 platform.