More than any other component of your phone, the display drains the maximum battery. Now a days mostly phones include an auto-brightness feature that automatically adjusts the screen's brightness to suit ambient lighting levels.
This mode uses less power than constantly running your screen at full brightness
but still you would get better result if you would manually keep your display at low level. this one tip will extend the life of your battery dramatically.
2. Don't let your phone overheat ,Keep it cool
Exposing the battery to high temperatures can be more stressful than cycling. According to Battery University, which runs an extensive array of battery tests - cycling, elevated temperature and ageing decrease the performance of your battery over time. Keeping your devices in a cool environment (battery dwelling above 30°C (86°F) is considered elevated temperature) will certainly enhance the lifecycle of your device.
3. Don't use your phone while charging
In general, avoid using the phone while it is charging. This is called parasitic charging and this kind of usage can apparently be quite damaging. "Small amounts of usage load stop the battery from entering a full charging cycle, damaging the battery," .It has scientific affect also.
4.Keep the screen timeout short
Under your phone's display settings menu, you should find an option labeled 'Screen Timeout' or something similar. (On an iPhone, look for Auto-Lock in the General settings menu.) This setting controls how long your phone's screen stays lit after receiving input, such as a tap.
Every second counts here, so set your timeout to the shortest available time. On most Android phones, the minimum is 15 seconds. If your screen timeout is currently set to 2 minutes, consider reducing that figure to 30 seconds or less. On an iPhone, the minimum you can set is 1 minute.
5. Don't use a fake charger
One important piece of advice is to use only the company's own chargers - this is particularly important if your phone supports quick charging. High capacity chargers can quickly charge the phone up to 70 percent capacity, but can also damage it in the process, if not properly optimised.
6.Turn off Bluetooth
No matter now much you love using Bluetooth with your hands-free headset, your wireless speaker or activity tracker, the extra radio is constantly listening for signals from the outside world. When you aren't in your car, or when you aren't playing music wirelessly, turn off the Bluetooth radio. This way, you can add an hour or more to your phone's battery life.
7. Turn off Wi-Fi
Phone's Wi-Fi radio is a serious battery drainer. While you will need to use your home or office Wi-Fi connection rather than 3G or 4G for internet access and other data services, there's little point in leaving the Wi-Fi radio on when you're out and about. Toggle it off when you go out the door, and turn it back on only when you plan to use data services within range of your Wi-Fi network. Android users can add the Wi-Fi toggle widget to their home screen to make this a one-tap process, or swipe down from the top of the screen (twice if you have Lollipop.)
If Wi-Fi is using too much of your battery, you may want to turn it off.
If your screen is dim, touch the screen to wake up the watch.
Swipe down from the top of the screen.
Swipe from right to left ? until you see Settings , then touch it.
Touch Wi-Fi settings.
If Wi-Fi is set to Automatic, touch to turn it off.
8. Turn off location tracking
According to a recent news report, the Facebook app drains the battery of iPhone users as it's constantly tracking the user's location using the GPS module. Turning off location tracking for apps that don't need your location will certainly help.
9. Don't leave apps running in the background
Multitasking - the ability to run more than one app at a time - is a powerful smartphone feature. It also burns a lot of energy, because every app you run uses a share of your phone's processor cycles.
Some apps themselves are particularly heavy on battery life. For example, Facebook has confirmed it is investigating reports that its iOS app could be to blame for significant battery drain, and is working on a fix.
10. Discover flight mode
The phone's distance to a cellular tower is known to affect standby time as well. So, if you're in a place with no network, it's best to turn your smartphone into Airplane mode (called Flight mode on some devices) to conserve battery life, rather than let your phone constantly seek a tower.
Follow these tips and you'll find that your phone will last a little longer between recharges - and the fewer recharge cycles you put it through in a day the longer the overall battery life will be.