10 standard nicads to make a 12v pack. 20 to make 24v although some use 19 in that case because of the high charged voltage. Goes over 15.3v, which I believe is the standard cutoff for inverters (inverters will shutdown above this voltage), when full for 10 pack in series.
There are ghurd's controllers if you need a fine grain approach to charge control (adjustable dump load controllers). Also, the better quality charge controllers have a charge cutoff which is variable. I would be hesitant using a charge controller which isn't made (or modified) for use with nicads. An adjustable constant current constant voltage power supply, used for electronics, would be better than a cheapie lead acid charger. If you had one of these, not only could charge them in a pack, but you could test each cell individually with controlled charges and discharges (using a large resistor) and match the similar capacity ones in strings (if you were doing 12v)
Those cells look alot like the bb600 spec ones EV people are using in their cars. There's even a yahoo group dedicated to them..
On the fieldlines (this) site is maybe some of the best info on wet cell nicads (on the whole web) if you want to search you will find the good stuff. Maybe search using google instead of the in built search function as it works better. Some of the info posted above is not very accurate to the care and attention these cells deserve. As looked after they should last a long time. Just don't keep them in the same company as PbA batteries!
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