I don't use iCloud music. And actually it varies on what you do. Of course playing games on your phone won't get you this great battery life. And to be honest, I haven't really touched my phone during the day mainly due to the fact that I work at the front desk.How are you getting 15 hours playing games do you have any special settings? Do u use iCloud music please let me know. That's the type of battery I'm looking for