HTC One User Manual page 63

Uninstall or disable apps that you never use.
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Many apps run processes or sync data in the background even
when you're not using them. If there are apps that you don't need
anymore, uninstall them.
If an app came preloaded and can't be uninstalled, disabling the
app can still prevent it from continuously running or syncing data.
In Settings > Apps, swipe to the All tab, tap the app, and then tap
Disable.
Limit background data and sync
Background data and sync can use a lot of battery power if you have many
apps syncing data in the background. It's recommended not to let apps
sync data too often. Determine which apps can be set with longer sync
times, or sync manually.
In Settings, tap Accounts & sync and check what types of data are
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being synced in your online accounts. When the battery is starting
to run low, temporarily disable syncing some data.
If you have many email accounts, consider prolonging the sync time
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of some accounts.
In the Mail app, select an account, tap
Receive, and then adjust the settings under Sync schedule.
When you're not traveling from one place to another, sync weather
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updates of only your current location, rather than in all of your
named cities. Open the Weather app, and then tap
remove unneeded cities.
Choose widgets wisely.
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Some widgets constantly sync data. Consider removing the ones
that are not important from your Home screen.
Your first week with your new phone
> Settings > Sync, Send &
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