Hey guys,

At the moment I'm making a portable, 9V battery-powered cigar box amp. It's for a school Design Technology project, so lots of extra work must be done
Anyway, one of the things I need to do is carry out a survey, so it would be great help if you could answer it for me.

The link

It should be run off a rechargeable battery of good quality that lasts long and has decent output.
Speaker selection will be critical to sound and also be a determining factor as to the size of the box.