CompTIA A+ Core 1 (220-1201)Hardware and Network TroubleshootingMedium
A user's smartphone case feels warm and the back panel appears to be bulging slightly outward. What is the MOST appropriate immediate action for the technician to take?
- APerform a factory reset to clear any software causing overheating
- BPower off the device and stop using or charging it immediately
- CCharge the device fully to test battery performance
- DPlace the device in a freezer to cool it down quickly
Show answer & explanationAnswer & explanation
Correct answer: B. Power off the device and stop using or charging it immediately
A bulging, warm battery is a sign of a swollen lithium-ion battery, which poses a fire or chemical hazard. The correct action is to power off the device immediately, stop charging or using it, and have the battery professionally removed and replaced; continuing to charge or use it risks combustion.
Why the other options are wrong
- A. A factory reset does nothing to address a physical battery hazard.
- C. Charging a swollen battery increases the risk of fire or rupture.
- D. Extreme temperature changes can worsen battery damage and are unsafe.
Swollen Battery Safety
A physically bulging lithium-ion battery indicates internal gas buildup from chemical breakdown and is a fire/safety hazard requiring immediate power-down and replacement.
- Swelling indicates internal battery damage
- Stop charging/using immediately
- Dispose of and replace via proper battery recycling procedures
Memory trick: A puffy battery is an angry battery — shut it down now!