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BADGE?: How do I Enhance a Badge? Enhance your Heroes’ green or higher badges to boost their bonuses! Use SD Cards and other badges as enchantment material. When you promote a Hero, a portion of any enhancements on those badges is returned to you in the form of SD Cards.
You need to get Team level 35 for unlock the “Enhance” building in the bottom left corner.
Green Badges take only 1 Enhancement Level
Blue Badges take 3 Enhancement Levels
Purple Badges take 5 Enhancement Levels
My enhancement building is in the bottom right. The bottom left is arena
Ops, i was wrong 
@Logik, my Enhancement Building is just the bottom right of the Arena. My bottom left is Coliseum.
So, I lose the enhancements to the stats of my heroes if I promote them when they have enhanced badges equipped? The stats will not carry over?
Yes, the enhancements will be gone if you promote your heroes with enhanced badges, but don’t worry, all isn’t lost. There’s a chance that the enhanced badges will bring back salvaged SD Cards.