Practice Test Geeks(CMT) Certified Mobile Tech Practice Test
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CMT Battery & Power Management Flashcards

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

Read the first 7 CMT Battery & Power Management flashcards as text

  1. What is the recommended storage charge level for a Li-Ion battery if a device will not be used for an extended period?

    Answer: Approximately 40–60%

    Storing a Li-Ion battery at approximately 40–60% charge minimizes stress on the cells and slows capacity degradation during long-term storage.

  2. Which USB Power Delivery (USB-PD) feature allows a device to act as both a charger and a chargeable device?

    Answer: Dual-Role Power (DRP)

    Dual-Role Power (DRP) in USB Power Delivery allows a port to dynamically switch between acting as a power source and a power sink depending on what is connected.

  3. What unit is used to measure the rate of charge or discharge of a battery relative to its capacity?

    Answer: C-rate

    The C-rate expresses charging or discharging current relative to battery capacity; a 1C rate means the battery charges or discharges completely in one hour.

  4. What does the Battery Management System (BMS) in a smartphone primarily control?

    Answer: Charging voltage, current, temperature, and cell balancing to protect battery health

    The BMS monitors and controls charging parameters, temperature, state of charge, and cell balancing to protect the battery from damage and extend its lifespan.

  5. Wireless charging in smartphones most commonly uses which technology standard?

    Answer: Qi (pronounced 'chee') inductive charging

    Qi is the most widely adopted wireless charging standard for smartphones, using inductive coils to transfer energy between a charging pad and the device.

  6. Which setting on a smartphone most significantly reduces battery drain during periods of inactivity?

    Answer: Enabling Airplane Mode when not in use

    Airplane Mode disables all radios (cellular, Wi-Fi, Bluetooth, GPS), which are among the largest power consumers, dramatically reducing battery drain.

  7. What is 'trickle charging' in the context of mobile battery management?

    Answer: A slow, low-current charge applied to maintain a fully charged battery or recover a deeply discharged cell

    Trickle charging delivers a small, continuous current to maintain full charge without overcharging, and can safely recover batteries that have been deeply discharged.