NiMh batts do not need to be cycled. They do not retain a 'memory'.
To cycle Nicads, you need to discharge and recharge 3 times. It's best to do this at a controlled discharge rate, rather than running them down in the car. NiMh batts need to be charged at no more then their capacity.
NiMh 600Ma, set at 600Ma charge, or 1/2 amp, or trickle, depending on what type of charger you have.
Nicads can be charged at twice their capacity. 1200Ma pack can be charged at 2400, but not during cycling. During cycling, discharge at a controlled rate, and recharge at normal capacity. Always allow them to cool down completely between each discharge and recharge.
That's the best overall info I've gotten, and that's how I do mine. I even periodically cycle batteries this way during winter months when they are not being used.
Since I use a computerized charger, I don't have the exact info on what you should discharge each cell to, so someone else will have to add that info here.