Phone battery dies quick now and shows that game is using 90% of power

As title says. I have galaxy note 2 and 2 batteries. Both last all day with any other app or game. Used to be same with this but recently it last 30min with this game running and plugged into charger. Anyone sle have this problem?(wtf)

Comments
Please note that USB chargers charge devices much slower than if using AC powered charger and you may be using more resources than your charger is actually charging. Or do you mean it goes from full to depleted battery in 30 minutes when playing the game?
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