Battery time and enhancement features

Question

Smartphone’s are known for consuming a lot of battery power and depending on your configuration your phone might last longer or shorter than other phones. This topic contains some advice and info about what you can do to increase your battery time.
When using your new Android phone it will take approximately up to a week or so before the phone settles in its battery usage and power management, depending on applications installed and the amount of content in your phone. It’s worth mentioning that this evaluation that the phone runs in the background at first period of use will happen again after master reset or reinstalling/repairing the phone software. So if you have just reset or reinstalled your phone, this power management evaluation process will run again. So it might at first seem like your phone is consuming more battery power than before the reset, but its normal.
If you have been using your phone for a couple of week and still think that the battery time is a bit too low, here’s some advice that will increase the battery time.
First of all make sure that your phone is running on the latest version of the firmware. You can use PC Companion to check for software updates for your phone.
http://www.sonymobile.com/gb/tools/pc-companion/
Or Bridge for Mac if you’re a Mac user:
http://www.sonymobile.com/gb/tools/bridge-for-mac/
You can also check battery consumption via the menu; Settings > About phone > Battery use, or Settings > Battery, or Settings > Power management > Battery.
Things that can be disabled or reduced when you don't need them: 
Dim the screen
Disable live wallpaper if used
Turn off 3G (WCDMA), 4G (LTE).
Turn off mobile data traffic
Turn off Bluetooth®
Turn off Wi-Fi®
Turn off GPS
By doing this you will increase your battery time. But if you're still experiencing a low battery time you can try the following as proposed by many users on the forum. (Only applies for phones using removable battery)
When phone reaches 50% in battery level turn it off and pick out the battery for a few minutes. Put it back and connect the charger, now charge the phone turned off for about 5 hours or overnight. Start the phone as normal and check if the battery life time has improved.
You can also let the phone drain the battery completely until it turns itself on and won’t start again.
At this point connect the charger but do not turn on the phone, leave it charging while turned off until the battery indicator on the screen is completely filled.
Also make sure that you’re using a Sony original charger.
Battery enhancement features
Extended standby mode
Use the extended standby mode to make the battery last longer. Your Wi-Fi® connection, data traffic and unused applications are then paused when the phone is in standby. You can still receive phone calls, text and multimedia messages. Once the phone is used again, all paused functions are resumed.
You can enable/disable Extended standby mode via Settings > Power management. (Depending on model)
STAMINA mode
It has already been mentioned a couple of times that Smartphone’s use a lot of power, even when you’re not actively using them. All those app’s that you have on your phone may still be running in the background, draining your battery. STAMINA mode is a further development of Extended standby mode and saves wasted battery drain by recognizing when your display is off and turning off functions you don’t need, while keeping the notifications you want. As soon as you wake up your Android Smartphone, everything is up and running again.
Get only the important notices.
With Battery STAMINA mode, Wi-Fi® and data traffic are disabled during standby, but you still receive incoming calls, texts, and alarms. And since everyone has different needs, you can easily customize which app's you want to receive push notifications from even in standby mode. Facebook notifications on or off? It’s up to you.
The STAMINA mode will constantly re-evaluate your usage and update the expected standby time accordingly.
This standby time will completely vary depending on your own personal usage. You may see that when you first start using your handset, the Standby time will be higher than what is expected after you have used the handset for a few days. This is due to STAMINA mode having no previous usage history to estimate from.
If you have a very high usage level, you may only see a slight improvement between having STAMINA enabled and disabled. STAMINA mode is more effective the more often the display is turned off as this is when the power saving features kick in. If the display is rarely turned off, you may not see much improvement in the battery performance.
You can enable/disable STAMINA standby mode via Settings > Power management. (Depending on model)
 - Community Manager Sony Xperia Support Forum
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Answer 1

To turn sound off (and on) try holding the lowest right button (#) for a bit longer time. Works with most phones.