So, I updated again, RedPower 2 Prerelease 4c, for Minecraft 1.0.0. Download button up top, like usual.
This is an incremental bugfix release, with only a few changes. One bug has been causing a fair amount of trouble, and there was previously no way of getting Blutricity in the Nether. Moving batteries around is less than ideal, but since Sorting Machines and Retrievers use so little power, at least now you will be able to sort things in a nether base.
Improved damaged item comparisons.
Fixed counting bug in Filters, etc.
Fixed default coloring in empty Sorting Machines.
Back-ported the new Battery Box.