DEV Community: Kamran Liaquat Ali

How Windows Battery Reports Work—and How I Built a Private Browser Analyzer

Kamran Liaquat Ali — Wed, 07 Oct 2026 11:14:09 +0000

How Windows battery reports become useful data

Windows can generate a detailed battery report with one built-in command:

powercfg /batteryreport

The resulting battery-report.html contains useful information, but most of it is presented as technical tables. Design capacity, full charge capacity, cycle count, usage history, and battery life estimates are all there—the difficult part is interpreting them correctly.

I built a browser-based analyzer to make that report easier to understand without sending the file to a server.

The two values behind battery health

The most common calculation compares:

Design Capacity: the charge capacity specified when the battery was new.
Full Charge Capacity: the maximum charge the battery can currently hold.

A simple reported-capacity estimate is:

Battery health (%) = Full Charge Capacity ÷ Design Capacity × 100

For example, a battery with a 50,000 mWh design capacity and a 42,500 mWh full charge capacity reports roughly 85% capacity health.

That number is useful context, but it is not a complete diagnosis. Runtime also depends on workload, display brightness, background activity, temperature, power settings, and calibration. Physical warning signs such as swelling, leaking, odor, or unusual heat should never be reduced to a percentage.

Parsing the report locally

The privacy requirement shaped the implementation. A battery report can reveal device and usage information, so the selected HTML file should not need to leave the user's browser.

The browser's FileReader API can read the report as text:

const reader = new FileReader();

reader.onload = () => {
  const html = reader.result;
  const documentCopy = new DOMParser().parseFromString(html, 'text/html');
  // Extract only the battery fields needed for the result.
};

reader.readAsText(file);

No upload endpoint is required. The report is processed in memory, and the page can extract the relevant table labels and values directly.

Report formats are not perfectly consistent

The difficult part was not the formula—it was handling variations in Windows reports.

A robust parser has to account for:

Multiple installed batteries.
Missing cycle-count values.
Localized or slightly different table structures.
Capacity values containing commas and units.
Reports where capacity history is incomplete.
Devices that expose limited information through firmware.

Instead of assuming fixed table positions, the parser searches for known labels and then normalizes the surrounding values. When a value is missing, the interface should say that Windows did not report it rather than inventing an estimate.

Cycle count needs context

Cycle count is often misunderstood. One cycle represents cumulative use equal to 100% of the battery's capacity; it does not necessarily mean a single charge from 0% to 100%.

It is a supporting signal, not a universal pass-or-fail threshold. Two batteries with the same cycle count can have different capacity, runtime, temperature history, and physical condition.

Capacity history is more useful than one reading

A single percentage can be affected by calibration and reporting behavior. Capacity history helps reveal whether the decline is gradual or whether a sudden change deserves investigation.

The analyzer therefore treats the latest health percentage as one part of the result and presents history, cycle count, and practical next steps alongside it.

The finished tool

You can try the live Windows battery report analyzer without creating an account. It supports a generated battery-report.html file and manual capacity entry. Processing happens locally in the browser.

I also documented the small helper project and report workflow on GitHub.

The main lesson from building it was simple: extracting a number is easy; explaining its limitations clearly is the real product work.

How to Diagnose Modern Standby Battery Drain with SleepStudy

Kamran Liaquat Ali — Sun, 04 Oct 2026 17:17:30 +0000

Modern Standby is designed to make a Windows laptop wake quickly, but it can also make overnight battery drain harder to explain. The normal battery report shows when the PC was active or suspended. SleepStudy goes further by showing what happened while the screen was off.

This workflow helps separate a one-off event from a repeatable standby problem.

1. Confirm that the PC supports Modern Standby

Open Command Prompt and run:

powercfg /a

Look for Standby (S0 Low Power Idle). If the machine only lists traditional S3 sleep, SleepStudy is not the right primary diagnostic for that device.

The distinction matters because “Suspended” and “Connected Standby” are power-state labels, not battery-health scores. This guide to Suspended and Connected Standby explains how those entries appear in a Windows battery report.

2. Generate a SleepStudy report

Run Command Prompt as administrator and use:

powercfg /sleepstudy /output "%USERPROFILE%\Desktop\sleepstudy-report.html"

Windows saves an HTML report on the desktop. Open it in a browser.

By default, the report covers the most recent three days. To review a longer period, you can request seven days:

powercfg /sleepstudy /duration 7

A longer report is not always better. Start with a period that includes a specific incident you remember, such as a night when the laptop woke warm or lost an unusual amount of charge.

3. Start with the session summary

Do not begin with the reddest row and assume it is the cause. First match the session to a real event.

Check:

Start time: Did it match closing the lid or choosing Sleep?
Duration: Very short sessions can produce dramatic hourly rates.
Energy change: How much estimated battery energy was used?
Power source: Was the laptop on battery for the full session?
State: Did Windows record screen-off and sleep phases?

Compare several similar sessions. One bad session may be caused by an update, maintenance task, active audio, a dock, or a peripheral.

4. Use low-power residency as a clue

SleepStudy may show low-power or DRIPS residency. DRIPS refers to the deepest runtime idle platform state used during Modern Standby.

Low residency means the platform spent less time in its deepest idle state. It does not automatically identify the cause. Treat it as a direction for investigation, then inspect the components associated with activity.

Hardware, firmware, session length, network state, and drivers all affect the result, so there is no single universal percentage that proves a laptop is healthy or faulty.

5. Treat top offenders as leads, not verdicts

A top offender may be a driver, device, network component, storage process, audio service, or background task. The name means the component was associated with activity during that session. It does not prove the component is broken.

Before changing anything, ask:

Does the same item appear in several poor sessions?
Does it match what the laptop was doing at that time?
Is there a supported update or setting from Windows Update or the manufacturer?

Avoid random registry tweaks that force a sleep mode the hardware was not designed to use.

6. Run a controlled comparison

A simple test is more useful than changing five settings at once:

Charge the laptop to a known level.
Unplug it and let startup activity settle.
Close unnecessary apps and note the time.
Put the laptop to sleep for at least one hour.
Wake it, record the remaining charge, and create a fresh report.
Repeat after changing one variable, such as disconnecting USB devices or enabling Airplane mode.

If the same component and high drain repeat across comparable sessions, the evidence is much stronger.

Sleep behavior is not the same as battery wear

A worn battery can make a modest energy loss look like a larger percentage drop because its full-charge capacity is smaller. A healthy-capacity battery can still drain quickly if the system remains too active during standby.

Use SleepStudy for standby behavior and the Windows battery report for capacity, cycle count, and capacity history.

For screenshots, interpretation rules, troubleshooting steps, and the full controlled-test workflow, see this complete Windows SleepStudy report walkthrough.

Bottom line

SleepStudy works best as an evidence trail. Confirm Modern Standby support, match the report to a real session, compare energy change and low-power residency, and look for recurring activity before applying a supported fix.

Do not continue testing a battery that is swollen, leaking, smoking, producing an odor, unusually hot, or deforming the laptop case. Stop using and charging the device and seek qualified service.

Why Windows 11 Battery Report Shows No Cycle Count

Kamran Liaquat Ali — Sun, 13 Sep 2026 18:51:23 +0000

A Windows battery report can show design capacity, full charge capacity, recent usage, and battery life estimates. But on many laptops, the Cycle Count field is blank or missing entirely.

That does not automatically mean the battery has completed zero cycles. In most cases, Windows simply is not receiving that value from the battery controller or system firmware.

First, confirm that you generated the report correctly

Open Windows Terminal or Command Prompt and run:

powercfg /batteryreport

Windows will display the path where it saved the HTML report. Open that file in a browser, then find the Installed batteries section.

A typical entry may include:

Manufacturer
Serial number
Chemistry
Design capacity
Full charge capacity
Cycle count

If the Cycle Count row is present but empty, the report itself is usually working. The missing value is a separate data-reporting limitation.

Why cycle count may be unavailable

1. The firmware does not expose the value

Windows does not measure charge cycles directly. It reads information reported by the laptop's embedded controller, battery-management system, and firmware. Some manufacturers expose capacity data but not cycle count.

2. The battery controller uses a different reporting method

An OEM utility may display cycle information even when the Windows report does not. This is common when the manufacturer reads proprietary battery data that the standard Windows interface cannot access.

3. BIOS or chipset components are outdated

Old firmware or power-management drivers can sometimes prevent battery information from being passed correctly to Windows. Use only the support page or update utility provided by your laptop manufacturer.

4. The battery has been replaced

A third-party or replacement battery may not report every field expected by the laptop. Capacity values can still appear while cycle count remains blank.

5. The hardware never supported cycle reporting

If the value has always been missing, the laptop may simply not support it. Reinstalling Windows will not create data that the hardware does not provide.

What to check next

Work through these checks in order:

Restart the laptop and generate a fresh battery report.
Install appropriate BIOS, chipset, and power-management updates from the manufacturer's official support page.
Check the manufacturer's battery diagnostic utility, if one is available.
Compare the report after a few normal charge and discharge sessions.
If a replacement battery is installed, confirm that it is compatible with the exact laptop model.

Do not use random “battery repair” applications. Software cannot restore chemically lost capacity, and an untrusted utility may create more problems than it solves.

Use capacity health when cycle count is missing

Cycle count is only one part of battery condition. You can still estimate capacity health using:

Full Charge Capacity ÷ Design Capacity × 100

For example, if design capacity is 50,000 mWh and full charge capacity is 40,000 mWh, the estimated capacity health is about 80%.

Treat this as an estimate rather than a laboratory measurement. Temperature, calibration, recent charging behavior, and controller reporting can affect individual readings. The trend across several reports is more useful than one isolated number.

A step-by-step reference

For screenshots, report locations, and model-specific troubleshooting ideas, see this detailed guide on checking laptop battery cycle count in Windows 11.

The link is most useful after you have confirmed that the report generates successfully but the Cycle Count value is still missing.

When should you worry?

A missing cycle count by itself is not a hardware failure. Pay more attention to symptoms such as:

Battery percentage dropping suddenly
Runtime becoming much shorter
Unexpected shutdowns
Failure to charge normally
Unusual heat, odor, or swelling

If the battery is swollen or physically deformed, stop using the device and contact the manufacturer or a qualified repair professional.

Final takeaway

A blank Cycle Count field usually means the value is not being reported, not that the battery has zero cycles. Use full charge capacity, design capacity, real-world runtime, and physical condition together to judge battery health.

Disclosure: This article was prepared with AI assistance and reviewed for clarity and technical accuracy.

How to Read a Windows Battery Report Without Doing the Math

Kamran Liaquat Ali — Tue, 08 Sep 2026 09:06:44 +0000

Windows includes a useful battery-report feature, but the generated report is not always easy to understand. It contains capacity figures, usage history, charge cycles, and battery-life estimates—all inside a technical HTML file.

Here is a simple way to generate the report, understand the important numbers, and estimate your laptop’s battery health.

Generate a Windows Battery Report

Open Command Prompt or Windows Terminal as an administrator and run:

powercfg /batteryreport

Windows will create an HTML report and display its saved location.

To save the report directly to your desktop, use:

powercfg /batteryreport /output "%USERPROFILE%\Desktop\battery-report.html"

Open the generated HTML file in your browser.

The Two Numbers That Matter Most

Inside the Installed batteries section, look for:

Design capacity
Full charge capacity

Design capacity is the amount of energy the battery was designed to hold when it was new.

Full charge capacity is the amount it can currently hold when fully charged.

It is normal for full charge capacity to decrease as a battery ages.

Calculate Battery Health

Use this formula:

Battery Health = (Full Charge Capacity ÷ Design Capacity) × 100

For example:

Design capacity:      50,000 mWh
Full charge capacity: 40,000 mWh

The calculation would be:

(40,000 ÷ 50,000) × 100 = 80%

The estimated battery health is therefore 80%.

This percentage is an estimate based on the capacity values reported by Windows. Battery calibration, temperature, firmware, and recent charging behaviour can affect the figures.

What Do the Other Sections Mean?

Recent Usage

This section shows when the laptop was active, suspended, or connected to power. It can help identify unexpected battery drain.

Battery Usage

The battery-usage chart shows how the charge level changed over time. Rapid drops may indicate heavy workloads, background activity, or an ageing battery.

Usage History

This section compares the time spent using battery power with the time connected to AC power.

Battery Capacity History

Capacity history shows how the battery’s full charge capacity has changed over time. A gradual decline is expected with normal battery ageing.

Battery Life Estimates

Windows estimates how long the laptop may run based on its recent usage and current battery capacity. These figures are estimates rather than guaranteed runtime.

An Easier Way to Read the Report

If you do not want to search through the HTML file and calculate the percentage manually, you can use Battery Health Lab.

The tool analyzes a Windows battery-report HTML file and presents the important capacity and battery-health information in a simpler format.

The process is straightforward:

Generate the report using powercfg /batteryreport.
Open Battery Health Lab.
Select the generated HTML report.
Review the battery-health summary.

Battery Health Is Not the Whole Story

A capacity percentage cannot diagnose every battery problem.

You should also watch for:

Unexpected shutdowns
Sudden battery-percentage drops
Slow or inconsistent charging
Excessive heat
Very short runtime
A laptop that only works while connected to power
Battery swelling

If a battery is swollen, stop using the device and seek professional assistance. Do not press, bend, or puncture the battery.

Final Thoughts

The Windows battery report provides useful information without requiring third-party desktop software. The main challenge is understanding which values matter.

Start with design capacity and full charge capacity, calculate their ratio, and then review capacity history and recent usage for additional context.

For a faster summary, a battery-report analyzer can handle the calculation and make the technical data easier to understand.

10 Free SEO Tools Every Developer and Blogger Should Bookmark

Kamran Liaquat Ali — Tue, 18 Aug 2026 11:52:12 +0000

Originally published on ProArticlesHub

If you build or write for the web, SEO checks are one of those things you know you should do consistently — but paid tools are expensive, and free ones are usually scattered across ten different sites with ads everywhere.

I put together a single free hub with 10 tools I actually use myself for auditing my own site (proarticleshub.com), and figured it might save other devs/bloggers some time too.

The Tools

Content-level checks:

Word Counter — quick count for content length targets
Keyword Density Checker — avoid keyword stuffing without guessing
SEO Title Length Checker — keeps your

in the 50–60 character sweet spot so Google doesn't truncate it Meta Description Length Checker — same idea, for the 150–160 character range Technical/on-page checks: URL Slug Generator — clean, SEO-friendly slugs from any text Bulk H1 Tag Checker — scan up to 500 pages at once for missing/duplicate H1s Bulk Image Alt Text Checker — find images missing alt text across your whole site in one pass Bulk Image Size & WebP Checker — catches oversized images and non-WebP formats that hurt Core Web Vitals Broken Link Checker — scans up to 500 URLs and exports a CSV of dead/redirected links Meta SEO Audit Tool — one-page check of title, description, canonical, robots, Open Graph, and Twitter Card tags together Why I Built the Bulk Versions Single-URL checkers are fine for one page, but if you're auditing an existing site with 50–100+ posts, checking one URL at a time is painful. The bulk tools (H1, image alt text, image size, broken links) let you paste a list or point at a sitemap and get a CSV report back — the same workflow I use monthly on my own site to catch things like: Posts where I forgot to add alt text months ago Old internal links pointing to posts I've since deleted or renamed Images that never got converted to WebP Try It Everything's free, no signup required: proarticleshub.com/free-online-seo-tools If you build something similar or have a tool you think should exist, I'd genuinely like to hear about it in the comments — always looking to add useful ones to the list.

On-Device AI in 2026: How Personal AI Assistants Are Becoming Smarter and More Private

Kamran Liaquat Ali — Wed, 21 Jan 2026 12:02:12 +0000

Artificial Intelligence is entering a new phase in 2026. AI no longer relies on cloud servers all the time. It now works on our devices. This is on-device AI. It is changing how AI assistants work. AI is now faster and more private on phones, laptops, and wearables.
But what exactly is on-device AI, and why does it matter so much in 2026?

What Is On-Device AI?
On-device AI works inside your phone or computer. Your data stays on the device instead of going to the cloud.

In simple terms, your phone or computer does the thinking on its own.

It reduces the need for internet access. It also gives users more control over their data.

Learn More

I’ve written a detailed article that explains how on-device AI works, why it matters in 2026, and how it is changing personal AI assistants.
Check it out here 👉 On-Device AI in 2026: Smarter and More Private AI Assistants

Agentic AI: Why 2025 Belongs to Autonomous Software

Kamran Liaquat Ali — Tue, 20 Jan 2026 08:59:32 +0000

Artificial Intelligence is no longer a future concept. By 2026, AI is already reshaping how people work, learn, and earn. From automated tools to smart assistants, AI has entered almost every profession.

At the same time, social media and news headlines are full of fear-driven claims that AI will replace human jobs entirely. This raises an important question.

Is AI truly a job killer in 2026, or is the fear exaggerated?

This article separates facts from hype and explains how AI is actually changing jobs, what roles are at risk, which careers are growing, and how individuals can stay relevant.

AI Is Changing Work, Not Ending It

The biggest misconception about AI is that it is designed to replace humans. In reality, AI is built to replace repetitive work, not human intelligence.

AI performs best at analyzing large amounts of data, automating routine processes, and recognizing patterns. Humans, however, still lead in creativity, emotional understanding, decision-making, and ethical judgment.

In 2026, most companies are not firing employees to install AI. Instead, they are using AI to help employees work faster and smarter.

Read More
I’ve written a complete guide that explores how artificial intelligence is reshaping careers, highlighting real-world job impacts, emerging opportunities, and practical ways to prepare for the future.
Check it out here 👉 How AI Will Change Jobs in 2026: Reality vs Hype

Vibe Coding: The Future of AI-Driven Software Development

Kamran Liaquat Ali — Tue, 30 Sep 2025 06:15:25 +0000

Vibe coding is a new AI-driven approach to development where you describe features in natural language and let the AI generate most of the code. Instead of focusing on syntax, you focus on ideas and keep refining through prompts.

It’s great for rapid prototyping and making coding accessible to non-experts, but there are challenges like messy code, security risks, and maintainability issues. Right now, it works best for small apps and experiments rather than large production systems.

👉 For a deeper breakdown, check my detailed blog here:
Vibe Coding: The Future of AI-Driven Software Development