Dennis,
I charge all of my glow drivers with my battery charger. Hi tec 4 station charger , I just cut the harness off of my old McDaniel charger and checked polarity , soldered a couple banana plugs and done.
I use the discharge / charge cycle option , this is a good way to check the capacity of a glow driver, as they age , the capacity of nicads decreases . I always write the ma that went back into the glow driver on a piece of tape on the glow driver .
If you just put on the original charger, you do not know how much energy you put back into the battery .
I set mine at .5 amp or less , depending on the capacity of the drivers to how long it takes to charge
I have hot shot and McDaniel glow drivers , some 4 or 5 years old