Marcus reports that his company iPhone, which used to last all day, now drains from full to empty by early afternoon after he installed several new apps. Battery health still reads 92 percent. What should the technician check FIRST to identify the cause?
- AEnable Low Power Mode so the phone throttles background activity, then ask Marcus whether the battery lasts longer over the next few days.
- BReplace the battery, because rapid drain from a phone that once lasted all day points to a worn cell that can no longer hold its rated charge.
- CPerform a factory reset and set the phone up as new to clear whatever background process is consuming the charge so quickly.
- DOpen the battery usage screen in Settings to see the per-app breakdown and find which newly installed app is consuming the most power. Correct
Why A is wrong: Low Power Mode can extend runtime, but applying a mitigation before finding the cause skips identifying which app is responsible, so it is not the correct first diagnostic step.
Why B is wrong: A worn battery does cause drain, but 92 percent battery health and the onset right after new installs point to software, so a hardware swap is premature.
Why C is wrong: A reset might stop the drain, but it is heavy-handed and destroys the evidence before the offending app is identified, so it is not the first step.
Why D is correct: The battery usage breakdown names the specific app draining the charge, and the drain began right after new installs, so checking it first correctly identifies the cause before any fix is applied.