Discharging cells

hi all excuse my ignorance but would it be any harm to the cells if i connect a motor to it to discharge it.

i havent purchased a discharger yet i got a tray but they still have loads of juice in them and i cant use that from the start becuse it gets terribly hot help advice needed

i wanted to try exactly the same thing but i dnt have a clue sorry cos i have just bought a nosram discharger board and just before i got it i charged up all my sells so i was woundering wat to do but io just left them charged and i am gna buy a little discharger off of bill michael. dnt have a clue tho sorry

put them on tray and cool them up with a little fan

It will take for ever to discharge a fully charged pack of cells on the nosram discharge tray as it is designed for equalizing a pack of cells.
You can do it by running a motor on them but may also take a while and be noisy.
Years ago before dischargers were available we used to make a discharger out of car headlight bulbs. we used to have 3-4 bulbs conected in series and made a cage to protect the bulbs out of stiff wire. You then solder two wires to the end of them and add croc clips. You are then set up and ready to connect the light bulb discharger to you pack. When the bulb goes out the oack is discharged.
WARNING: this was good for nicads as they liked being discharged down to zero. If u are doing this with 4200's be carful, use a volt meter and disconect the bulb/bulbs before the voltage drops below 5.4 volts.
Yuo can use as many bulbs as you like, the more you connect the quicker the process and higher the discharge ampage.
This is a crude way of doing it, but it works and is cheap.