I didn't see anything listed in the other threads. Are there any solutions other than the Seidio one? I don't like the way it "holds" the phone. Basically, I just need a mount with charger (or a way to rig up the normal car charger). The other inputs/outputs aren't needed.

I am looking for the same thing. I think there is a mount that will fit the extended battery but does not have the power supply.

I use the ProClip that's designed for an iPod - I think it's 840126 - it fits perfectly and with the swivel mount I can move it from horizontal to vertical very easily. - sheureka

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I thought that was for the normal battery. Does the extended battery fit with no issues?

I have the OEM extended battery and it's a perfect fit. I already had a vehicle mount and swivel, so all I needed was the holder. - sheureka

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Yes, the IPOD proclip works. The one made for the 6700 doesn't have enough room for the battery