With audio or the native texting app thats standard. With my 6+ i can get upwards of 14 hours using similar apps as you. Thats not real life to me though, albeit it may be to you. Anybody reading this thread: do not worry if you arent hitting stated hours on posts like this: you are most likely hitting 'normal' numbers and using your device differently. Youtube, whatsapp, safari, screen brightness, strength of cellular signal all drain your battery A lot quicker than an audio app in the background for 5 hours(still counts as usage) or just checking the lockscreen monitoring battery. My 6 gets around 7 hours under hard usage (youtube , LTE, downloading, games) and under the same circumstances my 6+ gets 10 hours. So in conclusion, your battery is average given the usage your app % usage