Choosing the right AC/DC adapter

Before you buy any AC/DC laptop adapter, please make sure the AC/DC laptop adapter will give you the correct voltage and suitable current output.To find out the voltage & current, turn your laptop over and look for a label, sticker or writing which shows the voltage and current, it should look something like the examples below. The voltage figure will have a "V" after the number i.e 19V and the current will have a "A" or "mA". i.e 3.15A, 950mA. You can also find ...

Charging Lithium Ion Laptop Computer Batteries

 Charging laptop computer batteries used to be easy in the good old days of Nickel Cadmium technology and lead acid cells. All you had to do was build a circuit that would adjust the voltage in such a way that the charging current did not exceed 50% of the laptop battery's milliAmp hour (mAh) capacity. A couple of hours later and presto - you had a charged laptop computer battery. A few milliAmps above or below the maximum capacity were easily tolerated, with only a slight degradation in the ove ...

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