While working the help desk, you receive a ticket from a field salesperson who reports that her company-issued smartphone loses almost half its charge within the first two hours of the workday, even when the screen is off. The battery-usage screen shows that the built-in mail client accounts for most of the consumption and that the device's cellular radio is active almost constantly. Which configuration change is MOST likely to extend the device's battery life without removing any required applications?
Disable automatic screen rotation in the display settings.
Increase the screen-timeout setting from 30 seconds to 2 minutes.
Leave the NFC radio enabled for quicker contactless payments.
Change the mail client from push synchronization to a scheduled fetch interval.
Push (always-on) email keeps the network radio awake so the server can deliver messages immediately. Switching the mail client to a scheduled fetch interval (or manual sync) lets the radio sleep between checks, greatly reducing background battery drain. Disabling screen rotation or lengthening the display timeout has little effect on the drain shown in the battery stats, and turning on NFC would add, not reduce, power usage.
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What is push synchronization in email, and how does it impact battery life?
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How does the cellular radio affect battery life, and why is it always active for push email?
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Why does NFC consume power even though it uses contactless technology?