depends what sort you have. If it is an equaliser then it should cut off the discharge at around 0.9v (anything below this can ruin NIMH cells). It will also level out the voltage in each cell in the pack, meaning when you charge them (assuming they are matched cells) they will all peak at the same time. This offers optimum performance as all cells are fully peaked, and also extends cell life as cells won;t get ruined by over charging while other cells in the pack are still coming up to peak.
if you have a plain discharger that only does the whole pack and not individual cells then i'm not sure if it is any use at all really.
hope that helps
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