That's why I'm interested

I have a B6 too. I don't expect it to last a long time, but the info on their website suggests that it might be ok for maybe up to 2 hours. I'm interested because when the weather gets warmer we sometimes go 'busking' (7-8 piece band). I use one of those battery operated QTX 'portable PA' units for my bass. It's not the best bass sound in the world, but it does a decent job. If I could power the B6 for a reasonable amount of time with the Joyo, thaty would be quite cool. If not, I still have a B1FourX and a MS-60B+ that run on batteries, but I prefer the B6.