I have the P2f mini e-bike and I do Postmates, Ubereats, etc in NYC. Not always able to find a place to charge it, and when it’s nice out I want to chill outside and just charge it while I work on my writing, yes I am a struggling writer obviously. I was looking at portable power banks that go for like100$-200$ that have AC three prong outlets or whatever they’re called, where I could plug in. Says they jumpstart cars, chRge computers, even power and play a tv.... So my question is, is there a powerful enough power bank to do this? How many mWh?