: A popular free tool for Windows that monitors discharge cycles and helps with battery calibration to extend lifespan.

Before downloading external software, try these built-in system tools which are often the most accurate.

Windows includes a "hidden" command that generates a comprehensive HTML report.

: A go-to for Mac users, this app tracks the battery’s health over time and shows the original design capacity versus its current maximum.

Checking your laptop’s battery health is the best way to determine if a sudden drop in performance is due to software drain or a physically aging battery. While most modern operating systems have built-in diagnostic tools that require no downloads, several third-party applications provide more granular data and real-time monitoring.