If you want one honest number for how much life your laptop battery has left compared to when it was new, BatteryInfoView gives it to you in about a minute — no installation, no account, and no guesswork. This guide walks through the whole process: downloading the official file, running it, opening the right view, and reading the two capacity figures that produce the Battery Health percentage. By the end you will know what your percentage means, what it does not mean, and what to do next if the number looks low.
New to the tool? Start on our download page for the verified file sizes and hashes, and browse the full Tutorials hub when you are done here. This walkthrough uses BatteryInfoView v1.27, released in March 2026.
Step 1: Download the official file
BatteryInfoView is a small freeware utility by Nir Sofer (NirSoft) for laptops and netbooks. It displays the current status and information about your battery, and nothing more — it does not calibrate, repair, or change any battery setting. There are two official packages: a 32-bit ZIP (118,909 bytes) and a 64-bit ZIP (132,819 bytes). On a modern 64-bit copy of Windows, choose the 64-bit build, which was added in v1.26; the 32-bit build works on both 32-bit and 64-bit Windows.
Use the official NirSoft file via /go/batteryinfoview — that link goes directly to the official NirSoft 64-bit ZIP. If you need the 32-bit package instead, it is listed on the download page. Save the ZIP anywhere you like, for example your Downloads folder or a USB stick. There is no installer to run in the next step, so the location you pick is simply where the extracted files will live.
Step 2: Extract and run BatteryInfoView.exe
Right-click the ZIP and choose Extract All, or open it and copy the contents out. Each official ZIP contains exactly three files: BatteryInfoView.exe, BatteryInfoView.chm (the help file), and readme.txt. Double-click BatteryInfoView.exe to run it. The program does not require any installation process or additional DLL files — you simply run the executable. In normal use it is run as a standard user; if Windows shows a security prompt for a downloaded file, confirm the file came from the official source and check its size against the figures above before proceeding.
The main window opens in Battery Information view by default. If you see a table of rows and values straight away, you are in the right place. If the window looks like a repeating log instead, press F7 to switch — the next step explains the two views.
Step 3: Open Battery Information view (F7)
BatteryInfoView has two view modes. Battery Information (F7) shows general status and information about your battery in a single table — this is the view you need for a health check. Battery Log (F8) adds a new status line every 30 seconds by default and is covered separately in our Battery Log guide. Press F7 now if you are not already in the information view.
The information view refreshes every 10 seconds by default. That interval can be changed in Advanced Options (F9). Four calculated fields — the estimated time fields — update only every 30 seconds or more, because they are worked out from how the capacity value changed over the preceding period. For a health check you do not need to wait: the capacity and health figures are shown as soon as the window opens.
Step 4: Read Battery Health, Full Charged Capacity, and Designed Capacity
Look for three rows in the table:
- Designed Capacity — the full capacity of the battery when it was completely new, usually shown in mWh (milliwatt-hours). This figure is fixed by the manufacturer and does not change as the battery ages.
- Full Charged Capacity — the capacity the battery can actually hold now when it is fully charged, also usually in mWh. This figure falls gradually with use and age.
- Battery Health (%) — calculated from the two figures above: Full Charged Capacity divided by Designed Capacity, multiplied by 100.
That calculation is the entire health check. BatteryInfoView does not use a hidden score, a benchmark run, or a discharge test — it compares what your battery can hold today with what it was designed to hold when new. NirSoft’s own wording is that the health of a new battery should be around 100%, and it gradually decreases. For the deeper maths and history, see Wear Level vs Battery Health and Battery Health % Explained.
A worked example — example numbers only
The numbers in this section are examples, not measurements from any real laptop. They are here only to show how to do the reading on your own machine. Suppose BatteryInfoView showed the following example values:
| Field (example) | Example value |
|---|---|
| Designed Capacity | 50,000 mWh (example) |
| Full Charged Capacity | 41,500 mWh (example) |
| Battery Health | 83.0% (example: 41,500 ÷ 50,000 × 100) |
Reading that example: the battery in the example can hold 41,500 mWh at a full charge compared with 50,000 mWh when new, so about 17% of its original capacity is no longer available. In everyday terms, a laptop that lasted five hours when new would, all else being equal, be expected to last noticeably less on the same workload — roughly in proportion to the lost capacity, though real runtime also depends on brightness, workload, and background activity. That proportional framing is general guidance, not a prediction BatteryInfoView makes for you.
Now repeat the same reading with your own three numbers. Write them down or export them (see the next step) so you can compare again in a few months and see whether the health figure is stable or falling.
Step 5: Save your result so you can compare later
A single health reading is a snapshot. Two readings a few months apart tell you whether wear is slow and steady or suddenly accelerating — which matters if you are deciding whether to plan a replacement. Select the rows you want (or select all), then press Ctrl+S (Save Selected Items) to save to a text, CSV, tab-delimited, HTML, or XML file. You can also copy the selection and paste it into Excel or another spreadsheet. The full export workflow, including saving a record before a warranty claim, is in How to Export a Battery Report.
While you are in the information view, it is also worth noting two other rows: Current Capacity (in %), which is the same charge percentage Windows displays, and Number of charge/discharge cycles, which shows your cycle count only if the battery provides it. Our companion guide, How to Check Your Laptop Battery Cycle Count, explains that field and what to do if it is blank.
What a low health percentage does — and does not — tell you
A lower health percentage means reduced maximum capacity. It does not, by itself, diagnose a faulty battery, a swollen battery, or a charging fault. Sudden shutdowns, a battery that will not charge, or a charge percentage that jumps around point to a different kind of problem and are worth investigating separately — start with our Troubleshooting hub and Capacity Readings Look Wrong? Equally, BatteryInfoView cannot fix wear: there is no calibration, repair, or charge-limit function in the program. It displays and logs information only.
As general editorial guidance — not a threshold published by NirSoft, because BatteryInfoView publishes no official good/fair/poor bands — most people only start actively shopping for a replacement when the reduced runtime actually gets in the way of how they use the laptop, rather than at a specific percentage. If that point is approaching, When Should You Replace a Laptop Battery? works through the decision without hype.
Frequently asked questions
Do I need to fully charge or discharge the battery before checking?
No special preparation is documented. The Full Charged Capacity and Designed Capacity values are reported by the battery itself, so you can open the program at any charge level and read them. For the most consistent comparisons over time, checking at a similar state — for example after a normal full charge — is a sensible habit, but it is not a requirement of the tool.
Why is my Battery Health slightly above or below what I expected?
Small differences are normal. The figures come from the battery’s own reporting, and Full Charged Capacity can move slightly between readings. Compare trends over months rather than reacting to a fraction of a percent between two readings on the same day.
Can I check health on a desktop PC or a Mac?
No. BatteryInfoView is for laptops and netbooks running Windows — officially any version of Windows starting from Windows 2000 and up to Windows 11. There is no Mac or Linux version. A desktop without a battery has no battery data to show.
Next steps: log drain over a day with the Battery Log (F8), export a dated record with Export a Battery Report, or return to the Tutorials hub for the rest of the series.