what kind of battery are u talking about? u can just short a AA battery with a paper clip or something.
but u cant do that with like a 6v or 12v car battery... if u short those out with a strait wire, it will cause damage to the cells, and u will prolly see what ever u use to short it out with mealt into the terminals, cause there's too much current.
if your talking about a car battery and u wont to drain it, just leave the car's lights on all night... or even better, unplug the relay for your fuel pump, and just ceep cranking the engine till it dies.
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why are u trying to discarge a bettery anyway? what kinda batt is it?
note- just incase your talking about a car battery that u plan an using ina car as some point... car batterys arnt meant to be fully discarged, if thy are left discarged for a long while(i forget the term its called) but something happens to the cells and it will die, wont able to be charged back up... if u store a car battery u have to make shur its fully charged, and recharge it once ina while.