Hi Junkflyer and others...
The equipment I use for my flying hobby (when I get the time), uses ni-cad batteries.
I 'deep cycle' them around every 3 months...
The discharging/charging equipment I use does this very efficiently.
The point I have here is in reference to your comment,
'..like to be discharged completely (...',
that, in my experience, is never the case.
Ni-cad cells are discharged to 1.1v and then immediately recharged!
Has kept mine going for quite some time!
I simply top them up between each use during the 3 month usage.
I simply work out their percentage efficiency to decide whether to retain or ditch them (recycle of course).
I need absolute reliability!