Thanks. These will still run on AA's at low RPM. To get the most out of them I recommend using six of the red Efest 700mAh 14500's that are still available on Ebay. Sergey's Board can handle it. I went with my magnetic augers that have undergone a few tweaks since I last posted about them. They are still the same materials, but we have found a few ways to optimize production, assembly, and function since.
They are starting to find their new homes today. I wish I could be a fly on the wall.
Also in case anyone missed it Sergey is now offering a reasonable reprogramming service of the SB-2's if anyone wants their board bumped up to the SB-4K, or the SB-4K V2.