Are there some good external portable macbook pro monitors that have the vertical/portrait functionality? Also, it should be rechargeable and should not get power from my laptop when there's still a charge. (I use MBP 15" 2018 model)

We are agile at work (all use laptops, no permanent seats) and I need an extra portale monitor because there are no provided external monitors to use.

I was thinking of buying and iPad pro as a portable external monitor via catalina sidecar but it is laggy somehow and very expensive. Thanks! 🙂