How it works
Battery health concerns usable capacity and reliable behaviour, not merely the charge percentage displayed today. Capacity estimates can vary with reporting and usage. Runtime also depends on the computer’s workload, brightness and connected accessories, so a shorter session does not always indicate sudden battery damage.
A practical example
A laptop may show 100% charged while holding less energy than when new. Another may drain faster during video processing despite unchanged capacity. Compare like-for-like use and condition reports before selecting a replacement.
What to check
Check the model’s battery report or supported diagnostic tool, charging equipment and real runtime. Note capacity trends, unexpected shutdowns and charging irregularities. Review heat and workload as well as the headline estimate, and use the manufacturer’s charging guidance.
Limits and safe next steps
Swelling, leaks, unusual heat or physical damage require stopping use and safe assessment. Do not puncture or squeeze a battery or attempt improvised repair. Condition reports are estimates, not guarantees; choose replacement and disposal according to the actual device’s guidance.