USB PD at 15V and 2.6A or 39W needed. Ideally, get a Aukey PA-Y10, which I am ordering for my laptop. It has 15V 3A USB PD and a 5V 2.1A USB A for your other devices, great for traveling.
Xiaomi 45/65W laptop chargers also provides 20/15V charging. I have the 65W. I also have a Tronsmart 30W USB PD plus 18W Quickcharge adapter, totaling 48W. all above buy from Qoo10.
Powerbank wise, try Xiaomi 45w 20000mah QB820, which I have. Bigger one will be Aukey XD26 26800mah 45w.
https://www.hardwarezone.com.sg/fea...how-select-power-adapter-or-power-bank-switch