It also helps me a bit to use earphones when listening to live music streaming like iheart. It does kill the battery quickly. You might also want to turn down the brightness on your screen, maybe around 40 or so. Every little bit helps.
I have a 9700 and listened to IHeart for about 3 hours yesterday while grilling the ribs. I had half a battery left when I finished. I also listen to IHeart to and from work each day and never had my battery run down.
When you say Bold, do you mean 9700? This phone has the longest battery life I've ever seen.