I use my iphone for all of my audio on my car stereo, but instead of using the headphone jack, I use the 30-pin connector since the audio quality is significantly better that way. I know that battery cases need to utilize the 30-pin connector of course, but I'm wondering if there's any of them that have a second one at the bottom of the battery case itself. I've found one, http://www.goincase.com/products/detail/snap-battery-case-ec20031/3, but want a case that protects the sides as of the phone as well. Has anyone come across a case that fits what I'm describing? Basically a battery case that would let me still get my audio from the 30-pin rather than the headphone jack?