Good price on this large 20,000mah power bank. It has a lcd screen that shows charge % and voltage/amp when something is plugged in.
I use one for my quest 2 and it works great (have it in my pocket). I also use the slow output port so not to stress the quest 2 battery since you are charging/playing at same. Depending on what I am doing, it on average loses about 1% every 10 minutes using that port.
Seems to have a few reports of being faulty