There are programmable discharge boards, I.E. the novak one. Others that only have one purpose, discharge the cells. Why? Some only like to take their cells down to a certian point, others like to store them dead shorted. Another reason, some cannot afford the price of a $50 device and would rather pull the cells as they get to the desired level on their own to save cash.
There are tons of discussions on this subject. I suggest that you do a search to find the thousands of posts on proper battery maintenance. Ask anyone the best way to discharge batteries and you are likely to get at least two answers from each, each slightly different.
Speed Merchant Rev7, Tekin, TQ Racing (wire), Team Tamale
RC Excitement - Buy where you race, support your local tracks.