As SgtWookie noted, an incandescent bulb is a good way to discharge a battery since their resistance reduces as the voltage drops, tending to maintain the discharge current. Just use more lamps or a larger lamp to obtain a faster discharge. But don"t exceed the batteries maximum current rating (not necessarily determined by the AH rating).
Isn't it obvious you will need to buy some lower voltage ones?All my incandescent bulbs are 240v.
I can't see how that would work.