04-13-2016 01:46 PM - last edited on 04-14-2016 07:07 AM by Majestic
04-14-2016 07:18 AM
Welcome to the Lenovo Community !
The G580 models requires a minimum of a 65 watts, 20 VDC, charger/adapter. The CPA-A065 model you have shown is compatible with those requirements. If you can find a 90 watt charger, that would be even better. The 90 watt will run cooler and charge faster when the laptop is in use.
Page #115 of your model's Hardware Maintenance Manual lists the 65 and 90 watt chargers for your model. Here is that manual for your reference.....
04-16-2016 07:32 AM - edited 04-16-2016 07:41 AM
I didn't say it was legit, only stated it would be compatible. Based on your listing of the CPA-A065 part number, it is most likely a copy that is equivalent to the original. Doing a search on that number provides a list of sellers offering a compatible charger from a variety of sources and manufacturers.