Notebook power adapters are not universal, and the reasons for not being universal are as follows:First, the interface is differentMost laptop power adapter brands have different interfaces, which means that other brands of power adapters cannot be plugged into your laptop at all. The difference in interface is relatively safe, because at least you will not plug the power adapter that does not match the current or voltage to power the laptop, causing damage to the computer hardware.Second, the voltage is differentDifferent brands of laptop power adapter voltages are not the same, for example: IBM is generally 16V, Dell is 20V, Hp is 18.5V, Sony is 19.5V and so on. It can be seen that even if the power adapter interface is the same, you cannot use different brands of laptop power adapters for power supply.Third, the current is differentThe current of different brands of laptop power adapters is also different, for example: IBM is 4.5A in general, 3.34A in Dell, 2.7A in Hp, and 4.1A in Sony.In fact, the voltage and current of the same brand notebook power adapter are not the same. Therefore, even if you use a power adapter between the same brand of laptops, you must confirm the voltage and current specifications.

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