Swapping power supplies
It can be kind of complicated and confusing if you’re not familiar with how a power supply (and to some degree, electricity itself) works.
The short rules boil down to this:
- The output connector must match.
 - The polarity of the output connector must match.
 - The output voltage must be the same.
 In addition,
- The output amperage must be greater than or equal to that required by the laptop.
 or:
- The output wattage must be greater than or equal to that required by the laptop.
 
Source: Can I Use a Power Supply with a Higher Wattage Rating on my Laptop? – Ask Leo!


