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!
If no joy from the ebay link search for YSD-12180