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

Lithium-Ion batteries are the standard in modern mobile devices due to their high energy density, low self-discharge rate, and lack of memory effect.

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

LiPo batteries use a polymer electrolyte instead of liquid, allowing them to be manufactured in flexible, thin, and custom shapes that enable slimmer device designs.

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

Cold temperatures slow the electrochemical reactions within Li-Ion cells, temporarily reducing available capacity and increasing internal resistance.

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

Battery capacity is expressed in milliamp-hours (mAh) and represents the total amount of electrical charge the battery can store and deliver.

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

Qualcomm Quick Charge negotiates increased voltage and/or current via the USB connection, allowing compatible devices to charge significantly faster than standard USB charging.

(CMT) Certified Mobile Tech Practice Test

(CMT) Certified Mobile Tech Practice Test

CMT CMT Battery & Power Management