I had built one using the AC plug, but was annoyed at how it would shut down without warning (no batt meter) as soon as it dropped below 6V. So I connected my D-cell pack to a small wooden block shaped like the 4XAA sled with 2 gold strips along it to fit in place of the 4AA sled of the deck. This allowed me to use the internal D8 battery meter as well as rundown the D cells below 6V towards ~4.8 V, which is where the D8 shows 1 or 2 'blocks' of power left. I was able to get about 40 hrs off a set of 4 alkaline D cells compared to the 15-20 I got via AC plug. It was also a much more solid connection than a simple plug.