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mattiapsu
Copper

AC Adapter polarity - Latitude

I recently got a new work computer (Latitude E7250) and got a new AC adapter with it. I wanted to confirm whether I could still use my old adapter as a spare, so I checked out the voltage and amps, which look to be fine. However, the polarity on the new adapter is different than the old one. Will this be an issue? Does polarity matter if the laptop is docked, meaning does the dock compensate for differences in polarity from the adapter?

Old adapter output: 19.5 V, 4.3A; polarity - c +

New adapter output: 19.5 V, 3.4A; polarity + c -

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3 Replies

RE: AC Adapter polarity - Latitude

Hi, 

Thanks for writing to us. 

It is NOT advisable to plug an adapter with a wrong polarity into a device. It will sometimes not supply power and in some cases cause damage to the device or the adapter eventually. 

Regards

DELL-Hemalatha P
Social Media Support
#IWork4Dell
Dell Support Videos 
Drivers and Downloads

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mattiapsu
Copper

RE: AC Adapter polarity - Latitude

Can you comment whether the dock makes a difference? Does this negate the adapter polarity differences?

Additionally, is there a way to confirm on the laptop/battery what polarity is required?

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RE: AC Adapter polarity - Latitude


Dock does not negative the polarity differences.

Hope the below table helps

AC ADAPTER::

Input Voltage

  • 100-240 VAC for 65 W/90 W

Input Current (maximum)

  • 1.7 A for 65 W

  • 1.5 A for 90 W

Input Frequency

47-63 Hz

Output Current

  • 3.34 A (continuous) for 65 W

  • 4.62 A (continuous) for 90 W

BATTERY ::

Voltage

  • 11.1 VDC (3-cell)

  • 7.4 VDC (4-cell)

Regards

DELL-Hemalatha P
Social Media Support
#IWork4Dell
Dell Support Videos 
Drivers and Downloads

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