New battery not detected

[Gigioromba]

Hello, I replaced my battery with a non official one.

The battery is working, charging and discharging as intended, but there are several problems.

• The laptop turns on only when the AC adapter is connected, it cannot start on battery only, even if it is fully charged.
• The battery is not detected by System Diagnostics if the AC adapter is plugged in, and when it is not plugged in it is detected as a battery that needs calibration.
• The battery is not detected by HP Support Assistance.
• The battery indicator is always showing 100% on Windows (and the tooltip on mouse hovering is showing only an empty little square). But in Windows Settings, battery levels are always 0% (they do not trigger battery saving though).
• The charging is very slow, even with a 100W adapter. About 5Wh/h.

This is what I tried without success:

• Update the BIOS to latest version.
• Uninstall, reinstall and update all the drivers.
• Perform a lot of calibration cycles.
• Remove and reinsert the battery.
• A lot of EC resets between various tests.

As I said, except for how strangely the battery is detected, it works, I measured it with HWiNFO and everything works as it should. But all the problem above, especially the power on needing the adapter, is making it very frustrating to use the laprisparmio batteria traduzionetop.

Any ideas?

Thanks

[VikramTheGreat · Accepted solution]

Hi @Gigioromba,

Welcome to the HP Support Community.
 

Thank you for posting your query. I will be glad to help you.

What you’re describing feels maddening: the battery does take and deliver power, yet Windows, HP tools, and even startup behavior don’t line up. The specific mix of symptoms you listed points less to “cell health” and more to how the battery’s smart controller is talking to the system (EC/BIOS). Let’s walk through the cleanest ways to fix it.

What to try (in order)

1) Do a true EC/RTC power drain reset

This clears latched protection states in the EC and the battery pack.

1. Shut down Windows fully (Shift + Shut down).
2. Unplug the AC and all peripherals.
3. Press and hold the power button for 20–30 seconds.
4. Reconnect AC only → power on and let it sit at the BIOS logo for ~10 seconds, then boot to Windows.
5. Now shut down again, disconnect the AC, and try to power on on battery only. 
   • If it still won’t, continue below.

If you’re comfortable opening the laptop, disconnect the battery cable from the system board for ~2–3 minutes (this imitates removing the RTC path on models that combine RTC with the main pack), then reconnect. If you’d rather not open it, skip this step.

2) BIOS power policies that can gate charging

Enter BIOS/UEFI (press F10 at startup):

• Battery Health Manager (under Advanced → Power on many models) 
  • Set to Let HP Manage My Battery (or Maximize My Battery Duration) temporarily.
  • Avoid “Maximize Battery Health” while diagnosing, because it can intentionally slow charging and hold at fixed % levels.
• Power on AC attach / After Power Loss 
  • Turn off (we want to see true battery‑only behavior).

Save & exit; test battery‑only boot again.

3) Reinstall the battery interface from Device Manager

We’re forcing Windows to rebuild the ACPI battery stack.

1. Right‑click Start → Device Manager.
2. Expand Batteries.
3. Right‑click and Uninstall device for: 
   • Microsoft AC Adapter
   • Microsoft ACPI‑Compliant Control Method Battery (and any “Smart Battery” entries)
4. From the menu, choose Action → Scan for hardware changes, or Restart.

Check if Windows now shows a sensible % and if the tray icon/Settings agree.

I hope this helps.

Take care and have an amazing day!
 

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Regards,

VikramTheGreat