Should You Leave Your Laptop Plugged In All the Time?

The answer

You can leave a modern laptop plugged in for desk use, but use the manufacturer's battery-health controls when available. Microsoft specifically recommends Smart Charging for devices that remain plugged in and notes that constant 100% charge can accelerate deterioration.

Why

Lithium-ion batteries age with time, cycling, state of charge, and temperature. Keeping the laptop plugged in does not mean the charger continuously forces energy into a full battery, but it can keep the battery at a high state of charge for long periods. Microsoft says Smart Charging lowers the target charge on supported devices to reduce that stress. Surface can automatically limit to 80% during prolonged plugged-in use, and Apple offers optimized charging and configurable limits on supported Mac laptops. The best practice is therefore to let the manufacturer's battery-management system do its job rather than repeatedly unplugging and reconnecting the laptop.

When it is usually OK

• Leave it plugged in when you need sustained performance or desk use and the device is operating at a normal temperature.
• Use Smart Charging, Optimized Charging, or a charge limit when the laptop spends many hours connected to power.
• Allow a full charge when you genuinely need maximum unplugged runtime.
• Keep the laptop ventilated so plugged-in workloads do not create excessive heat.

When you should not

• Do not intentionally keep the laptop hot and at 100% for prolonged periods if a battery-health mode can reduce that exposure.
• Do not cover vents or use the laptop on soft surfaces that trap heat during charging.
• Do not disable battery-health features merely because the laptop does not show 100%.
• Do not use damaged or unsupported power adapters to maintain continuous desk power.

Risks and exceptions

• Long periods at high charge can accelerate lithium-ion battery aging.
• Heat can permanently reduce battery capacity faster.
• Disabling smart charging for convenience can trade long-term battery health for immediate full capacity.
• A swollen battery is a safety issue and should not remain in normal service.

Best practice

For a laptop that lives on a desk, keep the manufacturer-supported smart or optimized charging feature enabled and maintain good ventilation. Temporarily charge to 100% only when you need the extra unplugged runtime.

Alternatives

• Use a dock or charger that meets the laptop manufacturer's power requirements.
• Set an 80% or similar charge limit if the manufacturer provides one and maximum portable runtime is not needed every day.
• Use battery power periodically as part of normal use rather than intentionally cycling from 100% to 0%.
• For long-term storage, follow the manufacturer's storage-charge guidance rather than leaving the device continuously plugged in.

Frequently asked questions

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