Aisycle heated jacket didn’t have too much requirement about the power bank, you only need an common power bank which output current is greater than 2A to power it.

And of course you can buy that on the internet, like amazon ebay or some other places.

It should be noted that if you purchase a heated jacket with gloves, you will need to use a power bank of 3A or more.

when you got the power bank and the Aisycle heated jacket, you can now referencing this article to learn how to use it.