Member Avatar for cambalinho

i'm using Windows 7.
the battery icon is showed on toolbar.
when i move the mouse the percent is showed, but no the time remain... why?

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  • Latest Post Latest Post by rproffitt

Dani AI

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Quick summary tied to the thread: when Windows 7 shows a percent but no “time remaining” it usually means the OS has unreliable or missing battery telemetry (ACPI/battery driver, firmware/BIOS or a worn battery), or the OEM/firmware has suppressed the estimate. ’s suggestion to use a separate battery monitor is a valid fallback, but repairing the OS telemetry gives a more reliable long‑term fix. (learn.microsoft.com)

Troubleshoot the OS telemetry first (common, fast fixes)

  • Open Device Manager → Batteries.
  • Right‑click Microsoft ACPI‑Compliant Control Method Battery → Uninstall.
  • From the Device Manager Action menu choose Scan for hardware changes (or reboot).
    If the battery is removable: shut down, remove it for ~30 seconds, reseat and boot then repeat the uninstall/scan. Do not remove the Microsoft AC Adapter entry; only the ACPI battery entry should be reinstalled. (techwalla.com)

Collect diagnostics (Windows 7 built‑in)

  • Run an elevated Command Prompt and generate an energy report:
    powercfg -energy

    Open the generated energy‑report.html (it includes a “Battery Information” section showing last full charge vs design capacity).

  • Query live battery telemetry with WMIC:
    wmic path Win32_Battery get EstimatedChargeRemaining, EstimatedRunTime, BatteryStatus

    (or use PowerShell Get‑CimInstance on Win32_Battery). These values show whether the battery firmware is providing run‑time estimates. (howtogeek.com)

Calibrate / firmware / BIOS
If telemetry is present but estimates are erratic, run the manufacturer’s battery test/calibration (or the manual charge→discharge→full‑charge routine). Update BIOS/ACPI/chipset drivers from the vendor—some BIOS settings or updates control whether “time remaining” is exposed to Windows. If the battery fails tests or is swollen, replacement is required. ()

Notes and fallback
Windows 7 uses the energy report/WMIC checks; the richer powercfg /batteryreport facility appears on later Windows releases, so a simple built‑in HTML battery history report may not be available on Win7. If hardware/firmware prevents Windows from showing time, a third‑party monitor is a pragmatic workaround (as noted) but it only displays whatever telemetry the battery/controller exposes. (learn.microsoft.com)

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Member Avatar for rproffitt

I no longer fix this. That is, I don't bother trying to get Windows to report this. I go get the free version of BatteryBar and get a better readout of the battery condition.

-> Second problem. Since the time remaining is not accurate it's probably best to not give remaining time. Why? Because how you use the laptop determines remaining time. The battery app can't guess if you are going to lower the brightness and browse the web, play a video or game. There is a 10 fold decrease in battery time for one activity to the next. Go get BatteryBar and call it a day.

Member Avatar for cambalinho

yes i'm using that program with 30 free days, maybe after that reinstall it, i can cover the 30 days ;)
please tell me 1 thing: after i answer you, do you recive any mail notification?
what i mean is that i didn't recive a mail notification when you answer me :(

Member Avatar for rproffitt

I used the free version and it's still working fine days, years later. Are you sure you got the free version?

As to the DANIWEB eamail notification, I don't check since it may not be instant.

Member Avatar for cambalinho

yes it's free. i just actiaved the 30 days for test it

cool: i came here because i recive the mail notification
thanks for all

Member Avatar for rproffitt

Did BatteryBar change? I never activated it, just install the free one since it will report what you askes and battery wear on most machines.

PS. Adding with edit. On worn batteries, predicting time remaining is not possible. I know folk will disagree but the more you encounter batteries with 70% or less remaining capacity the more you realize that predictions are just that.

Edited by rproffitt
Member Avatar for cambalinho

yes changes, we can change the theme and much more and change when the notification messages are showed

Member Avatar for rproffitt

Good to read it's still the things I don't need or care about. 99.9999% of the time I just need a better battery health report.

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