A user complains that their smartphone battery drains significantly faster than usual, despite normal usage patterns. They have not installed any new applications recently, and the device is relatively new. What is the FIRST action you should take to troubleshoot this issue?
Replace the battery with a new one.
Directly disable Bluetooth and Wi-Fi to save battery life.
Identify if any applications are using high amounts of resources.
Check for any pending OS updates and ensure the system is up to date.
The quickest way to narrow down the cause of a sudden battery drain is to use the phone's built-in Battery/Power-usage screen and look for any app or service drawing an unusually high percentage of power. If a runaway app is identified, it can be updated, force-stopped, or removed. Only after confirming that no single application is responsible should you proceed to steps such as applying OS updates, disabling radios, or considering battery replacement.
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Why are OS updates important for battery life?
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How do I check for OS updates on my smartphone?
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What other factors can contribute to battery drain apart from software issues?