Battle Fatigue is a debuff introduced with Mists of Pandaria that is primarily intended for PvP that makes it harder to get healed after being damaged.
In Patch 5.3
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- Patch 5.3.0 (21-May-2013): Debuff increased from 30% to 45%.
- Patch 5.1.0 (Hotfix 11-Dec-2012): Debuff increased from 15% to 30%.
- β Patch 5.0.1 (Beta): Added.