Notebook Hardware and Upgrade Questions

Hi all,

I have searched the forums, and I am aware that similar questions have been asked before. However, I have yet to find any information regarding my laptop. 

Laptop: HP ENVY Laptop 13-ad1xx (2SM00PA#AB4)

I have done some searching in other sources, and have gotten varying responses, none of which were conclusive. There are a couple of USB C ports on the laptop, with the lightning logo, which I am assuming indicating that the ports are capable of transferring power. 

I intend to purchase a power bank to charge my laptop when on the go. While the ideal solution would be to purchase a powerbank with AC capabilities, those are much costlier than USB C powerbanks. I have tried to charge my HP laptop with USB C cables unsuccessfully.

However, there I have hypothesized a couple of possible reasons due to my lack of suitable hardware available.

1) I am not using a USB C to USB C cable. Currently using a USB A to USB C cable.

2) The output is not sufficient as the only wall chargers I have on hand are from my Samsung S8. 

While those are easily solvable issues by purchasing the required equipment, I am afraid of finding out that my laptop is incapable of USB C charging after spending over $100 on those equipment. 

As the power adapter that came with my HP laptop is of 65W, can I purchase a powerbank with 65W output, and a USB C to USB C cable to charge my laptop? 

A secondary question - Can I purchase a wall charger of 65W output and use a USB C to USB C to charge my laptop as well? (This might help as I travel overseas frequently, and having a more compact and universal charger can save me precious luggage space)

While I understand the ideal solution would be to go to hardware stores and test out with my laptop, unfortunately, local hardware department stores in where I reside do not typically offer such service. It is challenging by itself to find large enough powerbanks being sold, as these are less popular items here. 

Thanks a lot for reading till this far. Appreciate any comments or advice.