A metrics battle lasts 24 hours, 3 days or 7 days. It is scored on the change in market cap, holders and trading volume during the fight, plus Boost points. It scores percent change, so a bigger coin does not win just for being bigger.
A vote battle lasts 1, 6, 12, 24 or 48 hours. Each wallet has one free vote worth 1 point. A Boost costs $1 and adds 1 point. The coin with more points wins.