Bad advice. A complete discharge is NEVER good for a lead acid battery of any type.
A battery's worst enemy is sitting unused at less than full charge. If not using a tender (float charger), charging it every few weeks/months will keep it in much better condition.
And BTW -- the whole "don't store them on concrete" thing is a myth from the Olden Days. The reason it started had nothing to do with the battery, it was because leaking acid messed up the concrete, which brings me to my point -- the reason the battery went dead sitting there wasn't because it was on concrete, it's because it was dirty. The dirt/grime across the top forms a very slight connection, and very slowly discharges the battery.
I guess I'll repeat my advice when I used to sell lead-acid batteries for all those years -- keep them charged and clean. Makes a huge difference.