Generally, the power of the charger must be equal or superior to the consumption of your laptop. This is indicated on the label on the bottom of the computer. Of course, this is an important parameter, but there are other details to consider when choosing a charger for your laptop. Let's discover without further delay in the following lines, the guide to make the right choice
Consider power rating.
You can see here adapter for acer iconia. You can use a 90 W charger to replace a 65 W or 45 W laptop charger. But you have to be careful that its voltage value does not vary from the original by more or less than one volt. Generally speaking, laptop chargers often have voltages between 18.5 V and 20 V, so there is nothing to worry about, but it is still important to be careful.
On the other hand, a charger with a power lower than that of your laptop is very strongly advised against. It may work, but since it will be used to its maximum capacity, it may quickly break down. Moreover, in case of high load, the computer could stop working due to lack of power, and the battery could not be recharged
Which connector to choose ?
You have identified the power of your computer, and at the same time the power of the charger that you should choose. Now you need to know which connector to choose for your computer. At first glance, all chargers look the same, but in reality, there are several types of connectors.
To do this, you need to identify the size of the connector, i.e., its inner and outer diameter. These elements are the reference values of the chargers communicated by the manufacturers.
If you measure with a ruler and you find a difference of 1-2 mm, it does not mean that the connector is not good. It is just that different people make their own measurements and small differences appear. Beyond 1-2mm difference, beware, it may be a different model.