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1.
A contest pitting 2 fictional or non-fictional; mostly fictional characters, analyzing each fighter's weapons, armor, and skills to determine who would in a battle to the death.
Speaker 1: Who would win in a fight Goku or Superman?

Speaker 2: Goku.

Speaker 3: What?! Superman would totally destroy Goku!

Speaker 1: Why don't we find out who would win. Just go on
ScrewAttack.com/DEATH BATTLE and then we'll see, who wins.
by Made by The Belatedtie23 January 13, 2013
 
2.
Adjective, An extremely difficult task, used to described events
Man, that test was such a death battle.
by Remi J. Dobbs May 03, 2006