The Lithium-Ion battery can be charged through the microUSB port on the top and provides 1.58 Wh (500 mAh @ 4.2 V, model PT802040).

It is connected to the mainboard with a JST plug meaning it can (in theory) be replaced when it has degraded after a few years—no soldering required, yay.

This little 4 Ohm 2.5 Watt driver seems to have a lot of "oomph" for its size compared to the Eneby Portable.

If you want to know more about the audio quality of this little guy you might want to head over to soundguys.com.