With Apple’s powerful new MacBook Pro models featuring M5 Pro and M5 Max chips now in users’ hands, a common question is resurfacing: Should you unplug the charger once the battery hits 100% while you continue working? The short answer, backed by Apple’s own engineering: No. Keep it plugged in.

Modern MacBooks, including the entire M-series lineup and the brand-new M5 models released just last month, are built with advanced power-management technology that changes everything about how you think about charging.

Once the battery reaches 100%, your MacBook stops charging the battery and runs directly from the power adapter.

The system bypasses the battery almost entirely, drawing electricity directly from the wall outlet rather than cycling power through the cells.

This is not a bug; it is a deliberate feature designed to protect long-term battery health.

Why Leaving It Plugged In Is Actually Better

Apple’s lithium-ion batteries last longest when they avoid constant full-charge stress and unnecessary charge cycles.

Here is how the system works in practice:

Direct Power Pass Through: When plugged in at 100%, the MacBook draws power directly from the charger rather than from the battery. You will see “Power Source: Power Adapter” in the menu bar.
Optimized Battery Charging: Enabled by default on macOS (and refined further in macOS Tahoe), this feature uses on-device machine learning to learn your daily routine. If it predicts you will stay plugged in for hours, it often holds the charge at around 80% and only tops up to 100% when it expects you will need a full battery soon.
No Risk Of Overcharging: The hardware and software work together to prevent damage from trickle charging. The battery may even let its level drop slightly (to 93–99%) while plugged in, then top up occasionally, all to calibrate and extend lifespan.

Apple has gone even further in recent macOS updates, adding a manual Charge Limit slider (80–100%) so users who keep their MacBook docked most of the time can set a lower maximum for greater longevity.

Real-World Advice For M5 MacBook Users

Tech communities and long-term owners consistently report excellent battery health (often 95–100% maximum capacity after 1–2 years) when the device is left plugged in during desk use.

Best Practices:

Keep the charger connected during long work sessions at home or the office.
Only unplug when you actually need to move around.
Make sure “Optimized Battery Charging” is turned on (System Settings → Battery).
Try the new Charge Limit feature if your MacBook stays plugged in 90% of the time.

Apple’s support documentation is crystal clear: “Your Mac will occasionally charge to 100% to maintain accurate battery state-of-charge estimates,” but the system is designed to minimize time spent at full charge.

So the next time your shiny new M5 MacBook Pro (or Air) hits 100%, relax. Leave the charger plugged in and keep working.

Your battery will actually thank you for it, and you will enjoy full performance without any power limits.

Have your own MacBook M5 charging questions? The tech community on X and Apple forums is full of users sharing similar experiences.