Maybe it’s a bit unfair to criticize the fact that John does not include a wall wart as most people will probably use the USB method to trickle charge the batteries off their computer. For that he does supply the necessary cable. People using a Squeezebox such as myself probably account for a small percentage of users.
I had issues charging the batteries in the beginning as I was not sure if the blue LED power switch needed to be turned “ON” for the batteries to charge when using a wall wart. The answer is NO.
At one point I had one USB cable hooked up to my source (SB) and the supplied USB power cable hooked up to a USB port on my nearby Oppo Bluray player. What I didn’t realize was that there is no power on the Oppo’s USB ports. Result: the batteries went dead.
This once again would not have happened if I was using a computer instead of a SB.
Also using a single USB adapter instead of a USB cable to connect the DAC is also much easier for someone using a laptop than for us SB users.
I guess these are minor nuisances when you consider the advantages of battery power. You get a completely quiet DAC without the need for expensive “Y” cables, isolating USB power modules and upgrade power cords.