What replacement adapter is sufficient?

[swampwiz]

I am in market to get a spare adapter.  Of course, I would like to get the least expensive.  It seems that the OEM adapter is rated at 19.5V 7.7A 150W. model TPN-DA09, and which says replace with 917649-850.  Also, does being a "smart" adapter mean anything other than increased profits for HP?

The most cost-efficient I have found is:

https://www.my-adaptor.com/hp-19.5v-7.7a-adapter-p-1709.html

This one looks to be just like the OEM, and indeed is compatible with the replacement model:

https://www.amazon.com/HP-Spare-917677-003-Adapter-Charger/dp/B07CSLM14D

This is another that claims to be HP, but doesn't seem to be exactly compatible:

https://www.amazon.com/HP-697317-001-External-power-supply

Then there is this one, which is only @ 19V, but 7.9A:

https://www.amazon.com/Original-HP-HSTNN-HA09-609919-001-Adapter/dp/B014K608JW

[Maké]

Hi!, @swampwiz :

Your notebook, use only AC-Adapter ...

• Part No: 917649-850
• Description: GNRC-19.5V, 7.7A, 150W ADPTR PFC SMART 4.5mm Slim
• Rohs: -N/A-

From, page 23, to ... http://h10032.www1.hp.com/ctg/Manual/c05493193

If you use other than not OEM (Original Equipment Manufacturer) and have any problem with your notebook, you lose, the warranty. 

[swampwiz]

So is this one OK?

http://www.usalaptopbattery.com/new-hp-917649-850-150w-19-5v-7-7a-smart-ac-adapter-power-charger-p-4...

[Maké]

Hi!, @swampwiz :

Try, from ... https://parts.hp.com/hpparts/Search_Results.aspx?mscssid=3ECB5DC606D84A7BB683F072211FF5FF&SearchIn=P...

Today the stock is zero (0), but you can consult for data of receipt.