01
Capacity estimate, not diagnosis
The calculator compares reported Full Charge Capacity with reported Design Capacity. It does not physically test a battery or diagnose every electrical, thermal, charging, firmware, or mechanical problem.
Important limitations
Disclaimer
CheckBatteryHealth provides general battery-capacity calculations and educational information. The site does not provide professional repair, engineering, electrical, legal, medical, or safety advice.
Use the result as one source of information and follow the device manufacturer's documentation, warnings, service procedures, and battery-safety instructions.
Calculation limits
What a battery health percentage can and cannot indicate
02
Source data can vary
Values depend on the operating system, battery controller, firmware, driver, calibration state, replacement history, and manufacturer reporting.
03
Results need context
A percentage should be considered together with actual runtime, charging behavior, unexpected shutdowns, temperature, physical condition, and manufacturer warnings.
04
No replacement guarantee
Condition labels and general guidance are informational. They are not a warranty, safety clearance, repair instruction, or definitive recommendation to keep or replace a battery.
Accuracy and availability
Information may be incomplete or unavailable
The site aims to present calculations and instructions clearly, but it does not guarantee that every operating system, battery, report format, driver, browser, or device will provide complete or compatible information.
Battery fields can be missing, outdated, unusual, or reported differently by different hardware and software. A failed analysis does not by itself establish a fault with the battery.
The site, API, links, and supporting content may be changed, interrupted, unavailable, or removed without guaranteeing continuous operation.
External resources
Third-party websites and documentation
The site may link to operating-system documentation, manufacturers, or other external resources. Those websites are controlled by their respective operators and may change independently.
A link does not imply ownership, endorsement, partnership, or a guarantee that the external content is complete or suitable for a particular device.
User responsibility
Verify before acting
You are responsible for confirming commands, file paths, capacity units, device instructions, warranty conditions, and repair procedures before acting on information from this site.
Do not open a device, remove a battery, alter firmware, or perform a repair unless the procedure is appropriate for the model and can be completed safely.
No warranties
The site is provided on an informational basis
To the maximum extent permitted by applicable law, the site and its content are provided without warranties of uninterrupted availability, compatibility, completeness, fitness for a particular purpose, or error-free operation.
Nothing on this page excludes a right or protection that cannot lawfully be excluded.
Related information
Review the methodology before using a result
Learn how the capacity formula works, review common questions, or report information that may require correction.