PoE Ice Trap, Psytrense builds

I just hit 100 with my Ice trapper and I've only done the bare minimum boss fights to unlock my voidstones. Now, I want to try to get better at bossing and learn more boss fights. I see a lot of Ice Trappers using Void Battery and a bunch of other uniques to maximize their power charges. Is this the play? Some of them are doing insane dmg!! I currently have 30 div to start this transition and wondering what items to start with. Thanks! My current POB: