Final answer:
The major concern with battery-powered smoke alarms is the need for routine battery replacement to ensure functionality because a constant drain on the battery occurs due to the ionization process, which is critical for the alarm's operation.
Step-by-step explanation:
A major concern with battery-powered smoke alarms is the need for regular battery replacement to ensure proper operation. Smoke alarms use a tiny amount of the radioactive element americium to ionize the air between two electrode plates, creating a small electric current.
This constant drain on the battery means that it will deplete over time, whether the alarm is triggered or not. When smoke impedes the ion flow, the drop in current activates the alarm, signifying a potential fire.
Regular maintenance is crucial since the failure to replace batteries can lead to a non-functional smoke alarm, which can be a safety hazard in the event of a fire.