Most laptop manufacturers have something equivalent to Microsoft's smart charging, though the implementation varies. It does this by limiting the maximum charge the battery to 80% of its normal capacity if your laptop is plugged in for a long time, or if your laptop is charging in a hot environment. Smart Charging is a feature built into Windows 10 and Windows 11 and used on some modern laptops - for example Microsoft's Surface Laptop 4 or the Surface Pro 8 - to try and improve the longevity of your battery. Smart charging has just temporarily limited your battery to extend its useful lifespan. You may have noticed that your laptop battery won't charge beyond 80%, despite it being plugged in for what feels like an eternity.
