Hi Waruiko

Kindly share the system service tag through the private message, we will be glad to assist you further.

Yes, it's compatible with your 7480. 

Welcome to the Dell Community  @Waruiko 

Look at the label on the bottom of the laptop for the Volts and Amps.

Volts x Amps = Watts

That will tell you the power requirements for your laptop.

Your AC adapter should be equal to or greater than that requirement!!!

Never less than the power requirements of the laptop.

Best regards,

U2

@Waruiko  I have no idea why DELL-Cares asked you for your service tag seeing as all Latitude 7480s are designed for the same type of power source.  But to answer your question, as long as you're using a Dell adapter (or a USB-C adapter that complies with the USB Power Delivery standard), then yes you will be fine.  I've been using a Dell 130W AC adapter in my living room with every Dell system my wife and I have owned over the last decade or so, including a Latitude 7480, and it's completely fine.  The Latitude 7480 is designed for a 65W power source, but you can absolutely use higher wattage sources than a given laptop is designed for because the system will always only draw what it wants/needs; the power source can't "force" it to draw more than it can handle.  If Dell's higher wattage power supplies also used higher voltage, that would be a problem, but Dell has been using 19.5 V for all of their barrel-style laptop AC adapters for over 15 years now, so if you're using a barrel-style adapter, you're good to go.  Higher wattage Dell power sources achieve that only by increasing their amperage, and again a power source can't force a device to accept more amperage.  The device controls the draw.

And if you're using a USB-C power adapter, the USB Power Delivery standard defines the allowed voltages and it contains measures to prevent a power source from delivering a voltage level that the device can't support, so you'd be good there too.  And as it happens, the Latitude 7480 is designed to draw the current maximum voltage allowed by the USB PD spec anyway, which is 20 V.