01
Transparent calculation
The site explains the capacity values used in the calculation and displays the formula instead of presenting an unexplained score.
Purpose and methodology
About CheckBatteryHealth
CheckBatteryHealth is a focused web utility for calculating and understanding reported battery capacity. It compares current Full Charge Capacity with original Design Capacity and presents the result with supporting context.
The site is intended to make battery-report information easier to interpret. It does not perform a physical battery test and does not replace manufacturer diagnostics or inspection by a qualified repair professional.
Site purpose
A clearer way to read battery capacity data
Operating systems and battery reports can expose values such as Design Capacity, Full Charge Capacity, cycle count, and battery condition. These terms are useful, but they can be confusing when presented without context.
CheckBatteryHealth organizes the core capacity calculation into a direct workflow: provide compatible source values, calculate the percentage, and review a neutral interpretation with limitations.
The supporting content explains how to locate battery information and why values measured in different units should not be combined.
Product principles
How the site should communicate battery health
02
Neutral interpretation
Results use measured language and do not present a capacity percentage as a complete repair, safety, or replacement diagnosis.
03
Useful platform guidance
The supporting guides explain how to locate relevant battery information on Windows, macOS, and Linux without treating unlike values as interchangeable.
04
No fabricated trust signals
The site should not publish invented ratings, reviews, experts, certifications, user counts, test results, partnerships, or update dates.
Calculation methodology
One capacity formula
The calculation uses Full Charge Capacity as the current reported capacity and Design Capacity as the original reported capacity.
Formula
Battery Health Percentage = (Full Charge Capacity ÷ Design Capacity) × 100
Both inputs must use the same unit. A value in mWh should not be compared with a value in mAh, and a percentage should not be entered as a raw capacity measurement.
Result handling
Preserve the reported calculation
Valid results above 100% should not be silently changed. They can occur because of calibration, replacement batteries, firmware behavior, or differences in manufacturer reporting.
A visual meter may be limited to its available width, but the numeric result and original source values should remain visible.
Condition labels are general interpretation categories. They are not warranties, professional diagnoses, or definitive replacement instructions.
Analyzer workflows
Two ways to provide battery information
Windows report workflow
A user can generate battery-report.html with Windows and submit the report through the analyzer. The report may contain installed-battery and capacity information supplied by Windows.
Uploaded reports are not a local-only workflow. The current analyzer submits the selected file to the site's analysis endpoint for processing.
Manual capacity workflow
A user can enter Design Capacity and Full Charge Capacity when both values are available in the same measurement unit.
Manual calculation should reject invalid values and should not silently convert, clamp, or reinterpret the source measurements.
Limitations
What the checker cannot determine
- The result depends on values reported by the operating system, firmware, battery controller, and device driver.
- Capacity percentage does not diagnose every charging, electrical, thermal, firmware, or physical battery problem.
- Calibration, replacement batteries, firmware behavior, and manufacturer reporting can produce unusual values, including results above 100%.
- Battery runtime also depends on workload, display brightness, background activity, temperature, power settings, and device configuration.
- A swollen, leaking, punctured, unusually hot, or otherwise damaged battery requires manufacturer safety guidance rather than an online percentage.
Data-processing transparency
Privacy information should reflect the actual workflow
CheckBatteryHealth should describe data processing clearly and avoid claims that are not supported by the implementation. The manual capacity calculator can calculate values in the browser, while the Windows report workflow submits the selected file to the site's analysis endpoint.
Manual calculation
Design Capacity and Full Charge Capacity can be processed in the interactive calculator without requiring a report upload.
Report processing
A selected Windows battery report is submitted to the analysis endpoint. The site should not describe this workflow as local-only processing.
Privacy disclosure
The Privacy Policy should accurately explain what information is received, processed, retained, logged, shared, and deleted by the application and its infrastructure.
Privacy wording should be updated whenever the analyzer, API, hosting, logging, analytics, advertising, or consent implementation changes.
Information standards
How supporting guidance should be maintained
Use primary references
Platform instructions should be checked against current documentation from Microsoft, Apple, Linux projects, or the relevant device manufacturer.
Separate facts from guidance
Technical facts, general interpretation, and safety limitations should remain clearly distinguishable.
Correct material errors
Incorrect commands, unsupported claims, or misleading interpretations should be corrected when identified, with a maintained history only when a real process exists.
Battery capacity analysis
Review your reported battery capacity
Use a supported Windows battery report or compatible manual capacity values to calculate the reported battery health percentage.