| What is an average voltage reading without load for a fully charged 4 cell | Nicad RX pack?
Freshly charged, with no load, the usual voltage of a single cell is about 1.4 volts. So your 4 cell pack would be about 5.6 volts.
HOWEVER
You may already know this, but a almost completely *discharged* pack may also show about 5.6 volts under no load. If you put it on a load, it'll drop a lot, but take the load away, and the voltage will creep back up, often very clsoe to that 5.6 volt figure.
So don't rely on the `no load' voltage for anything important.