A/C Adapter compatibility question, please help me!

I have a Dell Inspiron 9100 which uses the following A/C power adapter:

Model # ADP-150EB (PA-15 - P/N D2746)
Input 100-240V ~ 2500mA 50-60Hz.
Output 19.5V 7700mA 

What I would like to know is if I could use another A/C power adapter with my computer? Let me explain a friend of mine gave me his spare XPS2 laptop A/C power adapter.

Here are the specs for that adapter:
Model: PA-1131-02D (PA-13 - DP/N 9Y819)
Input 100-240V ~ 50-60Hz 2.5A.
Output 19.5V 6.7A

All I want to know is if this adapter is compatible with my Inpiron 9100 since all the plugs are the same and the specs seem almost identical?

Thanks in advance.

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Re: A/C Adapter compatibility question, please help me!

It's risky. If the system is designed to run with a 150W power supply, substituting a 120W could cause problems (including damaging the adapter and mainboard).
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