How to charge your smarphone correctly?
Modern smartphones are usually equipped with Li-Ion batteries and they must be properly charged. Firstly, you cannot discharge them to 0%. According to specialist, they should be charged between 40 to 80%. As a result, do not leave your phone charged overnight. Secondly, do not use your phone intensively while charging, mainly because during charging it is getting hot. The same situation is when you use power consuming applications. Higher temperature shortens the life of phone components. In addition, do not charge your phone under a pillow or in a bag, because heat dissipation is limited.
It maybe suprising, but you have to use a proper cable for charging. While you can buy a lot of cheap cables they do not allow to charge your phone with high current. If you cannot use an original cable, choose the one, which is dedicated for charging. It usually contains thicker ground and vcc wires, hence it allow to charge using current about 2A. To check the current value, you can use USB current voltage charging meters. Furthermore do not use very long cables, because the longer the cable, the greater its resistance.
First of all, use orignal charger delivered with the phone. If you have to change your charger, choose one, which has the same or similar parameters. Moreover remember, that there is several standards which decide, that phone recognize charger as a charger. Phone manufactures use special voltage configuration on D+ and D- lines to distinguish the USB port in the computer from the charger.
Please remember, do not experiment with the chargers and always consult your choice with the user guide.