I got 2 MA Audio speakers from a friend and he got 2 months left on the warranty so i was wondering if i took a car battery to them and got them replaced for free i would have brand new speakers for 75 bucks. what you guys think should i do it.

do it at your own risk man, some places replace their products differently....if they feel it was your fault they were blown, you may not get replacements and your out of a set of speakers and $75.
Just somthing to think about. later

Well.. if there'* nothing wrong with it.. don't do it ( personal preference ). Cause warrenty covers manufacturer defects and with it blown.. they can easily refuse and said you either Shorted the speakers or over powered it ( through the way the voicecoils would be burnt ) and say that it'* NOT something they did wrong at the plant.. if you're lucky and find a dumb *** that will do it for you right away at a store or somethin than you're in luck. But if its not broken.. don't fix it ( AND DON'T BREAK IT )
I too will also agree with LowLyfe83

no do not intentionally destroy those speakers. and people wonder why prices for everything go higher and higher all the time then they bitch about it.