Default Battery life, games

I like this pad soo much but i'm scared about battery life. I have One X which sucks and wont buy again device with ****y battery. So could any one tell me ex. How long you can play Real Racing 3? On my HTc it was not more then 3 hours . What's about WiFi how it shorts pad life? Sory if there was theard like this one but i cant find one with battery stats on gaming.