CMT Battery & Power Management Flashcards

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

Answer: Lithium-Ion (Li-Ion)

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.

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

Answer: Flexible form factor allowing thinner device designs

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.

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

Answer: Cold temperatures reduce chemical reaction efficiency in Li-Ion cells

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

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

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

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

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

Answer: Quick Charge (QC)

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

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

Answer: Reduced capacity from repeated partial discharges; most common in NiCd

Memory effect occurs in Nickel-Cadmium batteries when they are repeatedly partially discharged before recharging, causing the battery to 'remember' the lower capacity.

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

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

A swollen battery indicates gas buildup from internal chemical breakdown and poses serious fire and explosion risks; the battery must be replaced immediately and disposed of properly.