Once the wooden holder comes off, the batteries come out and you can easily and softly unplug them and take them out through the handle hole.

It is easy to plug in the new batteries (red is red is +), (- is - is black) and to put them back in.

The picture of the battery. Note that there is two (2, dos, dois, dwa, due) of them in the device. No point in just replacing one..!

Have fun charging and enjoying some 4 hours of 'unplugged' acoustic music... you might run into me on the downtown NY subway.. pardon my playing, but enjoy the sound of the amp.. it is simply beautiful and worth price and replacement effort..