I've seen a few arrangers out there that can run on batteries; usually lower-end ones. For quick jams and parties etc. where I don't want to bring my full rig (Genos-based), I kind of have started thinking about a lower-end, battery-powered arranger as a
"knock-around" toy, sort of :-)
I see that Korg EK-50 and Yamaha PSR-EW410 are possible choices. I'm sure there are others. I was surprised at the features on the EK-50 ... even has *3* RH voices you can layer (plus Left), just like Tyros/Genos.
I'll be checking around the 'net for demos and reviews etc., but thought I'd ask this here, in case anyone here has experience with battery-powered arranger keyboards ...
Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys