Ask from : Manour Ali < … @ mail.com >. Submitted on 2013/03/12 at 7:27 am.

Question : Hello,I had bought my Samsung Galaxy Y DUOS GT-S6102 in June 2012.The battery life was excellent till Jan-2013 (minimum 2 & maximum 3 days).But since then I don’t know what is the problem, the battery back-up is reduced to 3-4 hours even after full charging.I had restore my phone several times but no positive result.So, I have brought a new battery a week ago from the Samsung showroom but still the problem is the same

Can you please let me know the reason for this and also the solution.

Answer : Hi Manour Ali, The normal Samsung Y Duos GT-S6102  can use battery life about 9 hours. But, many of the features available on Android devices can cause batteries to become drained very quickly  Because of this, users of Android devices must intelligently and proactively manage the energy in their batteries.  Here is steps to check your battery performance from wikihow.com :

1. Please Ask your phone what is using the largest percentages of power by tab your Settings » About phone » Battery use. If you ask Android what’s using what percentage of available battery power, it will tell you. The vast majority of the time the biggest power hog is the display.
2. Tell the device to only use 2G networks by tab your Settings » Wireless controls » Mobile networks » Use only 2G networks). If you do not need access to high speed data, or there is no 3G network where you live, you can tell Android to only use 2G mobile networks. You will still have access to EDGE network data and WiFi if needed.
3. Please to Reduce the brightness of your display.  To reducing  the brightness of your display please get Settings » Sound & Display » Brightness. 
4. Please always use a black background by Google default. AMOLED screens can reduce power usage sevenfold by displaying black instead of white or any other color.
5. Les to Set your screen timeout to the shortest length possible. Tap settings » Sound & display » Screen timeout.  This setting tells the device to turn off the screen after the selected period of inactivity. The shorter the period, the less power your display will use.
6. Turn off the wireless feature when not needed. Tap Settings » Wireless controls » WiFi, or get the Wireless Settings free app. The wireless networking transmitter uses quite a bit of power. Even when the device is not connected to a network, it will continue to search for one on a regular basis.
7. Please to Turn off the Bluetooth feature when not needed. You can do it by tab your Settings » Wireless controls » Bluetooth) For the same reasons as you should turn off WiFi, turn off the Bluetooth feature if you are not using it.
8. Turn off the GPS ==> Settings » Security & location » Enable GPS satellites) When the GPS receiver in your Android device is active it looks for satellites, and its processor prepares information to be sent to any application that needs it, regardless of whether an application that uses the GPS is running or not. 
9. Please to use the Power Control widget. Select Home screen » Menu » Add » Widgets » Power control) As of Android 1.6, there is a widget that you can place on any one of your home screens that gives you quick control buttons for WiFi, Bluetooth, GPS, Push sync, and screen brightness (three levels). Use this to control your settings and turn them off to save battery power, as stated above. 
10. Please Turn off the phone vibration function. Get it by  Settings » Sound & display » Phone vibrate. The tiny device inside your phone that generates the vibration uses power every time it is activated. Alternatively, set the ringer volume all the way off, past the Vibrate setting.
11. Do not leave applications running when you don’t need them. Close them and return to the home screen.
12. Put your phone on standby mode when you are not using it. Simply press the red "End call" key and the display will darken. Press it again and it will light up.
13. Put the device in "Airplane Mode" while on an airline flight. Press and hold the "End call" key until a menu is displayed. Select the mode to turn off your phone’s transmitter. This will allow you to use the phone while in flight. Of course, if you don’t plan to use the phone, turning it off completely by selecting "Power off" is the ultimate power saving tip! To power on the device, press the "End call" key.
14. When traveling, take your charger as well as a USB cable with you. Most airports offer free charging devices or power outlets, but some may only offer a USB port to charge your phone.
15. Install a power management app on your device. There are several apps in the Android Market that specialize on managing power on Android devices. Most do this by controlling the activation and deactivation of systems on the device that consume power, such as the radio, screen, data and GPS.Please search for "power manager" on the Google play for some