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mostly the problem of sony ericsson phone is the battery, it drain fast. That is why it automatically switched off.. I suggest, don't use moving screen saver or too much used of lights (if applicable). And don't drain batteries before charging,it is better to charge atleast 1 bar left. thanks
You may have let your battery fully drained before you recharge it. If that is the case, it will never charge and turn on the unit. Using a voltmeter, check the voltage. Any voltage lower than 3 volts will not allow your battery to be charged no matter how. You need to "shock" it before you charge it. To do so, use a 9 volt battery and connect its terminals to the battery terminals with same polarity. That is, positive to positive and negative to negative. Do this for one minute or until the battery gets warm. Insert the battery then charge. If it successfully charged but dies early, you need to replace the battery. You may opt to borrow a friend's battery to directly check if it's really the battery.
The proper way of charging the battery on your phone is by waiting for your phone to indicate that it's running out of powe but not completelyr, if you frequently charge your phone even if it's not yet necessary(battery life indicator show half-way) the ability of the battery to store power will deminished hence the battery life is shorter. Last resort would be trying another battery unit to test if it's your battery of your phone that's causing the unsual battery drain.
Or you can try the following steps on conserving your phones battery life;
Turn off your Infrared and BlueTooth when not in use. Even when they are not in use, they do keep drawing power looking for signals.
Switch off the vibration alerts. Vibration causes a lot of power usage thereby making battery drain fast.
Re-adjust your screen brightness to around 50%. Screen power is another silent killer.
Usually, presetted Backlight durations are of pretty high order, this can be readjusted to get more from your battery. Try reducing the Backlight duration.
Often we don’t understand that playing games requires Light, Sounds and Shakes. This in turn leads to tripling of battery drainage.
Lower Ringing and other message sounds. This too helps saving a lot of battery.
Finally, do charge your battery before it gets drained fully. This enhances battery life.