I would highly recommend the ego passthroughs. For about a month it was my ONLY battery, and worked without a problem.
I don't charge till it needs it, but its so convenient to charge while you vape. In addition, regular ego batteries have to be charged through the top, which usually has a lil bit of juice in it, which means I was cleaning it out every time. These charge at the bottom, so no worries on corroding the charger!