Any iPod 30-pin chargers (usb or AC) with 30-pin PASS THRU?

[Mini 9]

I have bluetooth adapter that uses the 30 pin slot.
But for sitting at desk I wish to not discharge battery.
So, wondered if anyone has knowledge of a charger (any type) that allows another 30 pin device to be used while charger OR just using the external energy source for functioning.

Thanks.

[ADent]

There are a couple of battery packs with the 30 pin connector (which Apple actively discourages). The $20.75 MonoPrice does this ( http://www.monoprice.com/products/product.asp?c_id=108&cp_id=10831&cs_id=1083110&p_id=5866&seq=1&format=1#largeimage ).

Something like this is what you want: http://www.lightinthebox.com/Charge-Dock...70072.html .

[Mini 9]

thanks

[Mini 9]

I found the thing most what I look for. From what I can tell.

http://us.kensington.com/html/11205.html