Does Leaving Your MacBook Plugged In Ruin the Battery?

Leaving your MacBook plugged into a power source around the clock will not destroy its battery. While older nickel-based batteries suffered from “memory effect” and overcharging issues, modern MacBooks use lithium-ion batteries managed by sophisticated internal software. Once a modern Mac reaches a full charge, the circuitry automatically stops supplying power to the battery and routes electricity directly to the system components.