I’ve been looking for something to power-up my dwarf when I don’t have access to mains - primarily to tune-up, warm-up and practice a bit before performing.
So I didn’t need something that would run for many hours, and a lot of options seemed very heavy and pricey.
So I took a punt on one of these little li-ion batteries from ebay. When it arrived I was surprised how small it was - around the size of a small matchbox. It comes with a charger, and the output cable plugs straight in the back of the Dwarf.
I tested it out at home and it lasted over two hours - not bad for £18!
I would guess that this one would give you power for a full day. But this also depends on the stuff (MIDI controllers, Control Chain devices, etc) that you have connected
Well, from that point of view, I think that the iPad could probably have the higher consumption. I can find out for myself if necessary.
The idea of only IPad (including song sheets and backings) and Dwarf is sufficient for practising (via headphone) and tempting for campfire sessions.
Together with a Roland Cube Street Amp ( with 6 AA batteries) and enough Inputs (Guit, Mic and Aux for backing) , a usable capacity could result.
PS: with the USB/MID-Bluetooth Adopter the Ipad switched to Pedalboard and Snapshot.
That’s great - glad it worked for you.
I went to an open mic event on Sunday and there was no socket nearby so I ended up running off battery for the whole thing. Tempted to also get the 9600mAh version for extra peace of mind…
Thanks 
waiting for it to arrive still