CMT CMT Battery & Power Management

Question 1

Which battery chemistry is most commonly used in modern smartphones and tablets?

Accepted Answer

Lithium-Ion (Li-Ion)

Answer

Nickel-Metal Hydride (NiMH)

Answer

Nickel-Cadmium (NiCd)

Answer

Lead-Acid

Question 2

What is the primary advantage of Lithium-Polymer (LiPo) batteries over standard Li-Ion batteries in mobile devices?

Accepted Answer

Flexible form factor allowing thinner device designs

Answer

Higher voltage output

Answer

Faster charge times at all temperatures

Answer

Lower manufacturing cost

Question 3

A customer reports their phone battery drains much faster in cold weather. What is the most likely cause?

Accepted Answer

Cold temperatures reduce chemical reaction efficiency in Li-Ion cells

Answer

Software update corrupting battery calibration

Answer

Cold weather increases screen brightness automatically

Answer

The battery management IC is defective

Question 4

What does the term 'battery capacity' refer to in mobile devices?

Accepted Answer

The total charge a battery can store, measured in milliamp-hours (mAh)

Answer

The maximum voltage the battery can output

Answer

The number of full charge cycles a battery can complete

Answer

The physical size of the battery cell

Question 5

Which Qualcomm charging standard delivers rapid charging by negotiating higher voltage and current between the charger and device?

Accepted Answer

Quick Charge (QC)

Answer

USB Battery Charging 1.2

Answer

Trickle Charge Protocol

Answer

Adaptive Voltage Scaling

Question 6

What is 'battery memory effect' and which battery chemistry is most susceptible to it?

Accepted Answer

Reduced capacity from repeated partial discharges; most common in NiCd

Answer

Permanent capacity loss from overcharging; most common in Li-Ion

Answer

Swelling from heat exposure; most common in LiPo

Answer

Voltage drop from age; most common in Lead-Acid

Question 7

A technician notices a mobile device battery is visibly bulging. What is the correct course of action?

Accepted Answer

Replace the battery immediately as it poses a fire and explosion risk

Answer

Charge the battery fully and test device performance

Answer

Puncture the battery to release built-up gas safely

Answer

Place the device in direct sunlight to normalize the swelling