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Power & Battery Management Flashcards

7 cards from real ACMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which feature in macOS allows a MacBook to intelligently manage battery charging to reduce battery aging?

    Answer: Optimized Battery Charging

    Optimized Battery Charging learns a user's charging patterns and delays charging past 80% until the Mac predicts it will be needed, reducing time spent at full charge and slowing battery aging.

  2. What does Power Nap allow a MacBook to do while in sleep mode?

    Answer: Periodically wake to receive emails, calendar updates, and perform Time Machine backups

    Power Nap allows a MacBook to silently wake from sleep to fetch Mail, Calendars, Reminders, iCloud updates, and run Time Machine backups without fully waking the system.

  3. When replacing a MacBook battery, why is it important to follow Apple's battery recalibration or verification process after installation?

    Answer: To ensure the SMC correctly reads the new battery's capacity and cycle count for accurate status reporting

    The SMC reads battery authentication data and capacity information; running the proper post-replacement verification ensures accurate battery health reporting and confirms the battery is genuine.

  4. A MacBook charges very slowly or not at all when connected to a USB-C charger. What is the first step a technician should take?

    Answer: Test with a known-good Apple-branded USB-C power adapter and cable of the correct wattage

    Testing with a verified, known-good Apple-branded adapter of the correct wattage rules out a faulty charger or cable before investigating the Mac's charging hardware.

  5. What wattage USB-C charger does Apple recommend for the 14-inch MacBook Pro to enable full charging performance?

    Answer: 96W or higher (96W USB-C or 140W MagSafe 3)

    Apple recommends at least a 96W USB-C power adapter for the 14-inch MacBook Pro to support full-speed charging; the 140W MagSafe 3 adapter is also compatible and recommended for fast charging.

  6. Which macOS feature reduces the maximum battery charge level to 80% on MacBooks used primarily on AC power to extend battery lifespan?

    Answer: Battery Health Management (also called Optimized Battery Charging in some versions)

    Battery Health Management (available in macOS Catalina and later) limits charging to 80% on Macs frequently connected to power, reducing electrochemical stress and extending the battery's lifespan.

  7. When inspecting a Mac's power adapter, a technician notices the MagSafe connector is discolored and slightly melted. What is the safest course of action?

    Answer: Immediately replace the power adapter and advise the customer not to use it; inspect the Mac's MagSafe port for damage

    A discolored or melted MagSafe connector indicates a serious electrical fault and fire risk; the adapter must be replaced immediately and the Mac's port should be inspected before reconnecting any charger.