External backup battery doesn't work with OtterBox case

That's one big drawback of this case is it's hard to plug items into it. I even had to modify a car charger to work.

There is no adaptor that I know of and if there were it would put quite a bit of stress on the phone connector.

 

http://www.amazon.com/CableJive-dockStubz-Converter-Through-Adapter/dp/B003TJR2HS

Try that adapter, it should work.

 

I just got that adapter and it works OK. It's better than nothing, although it will add some height to the device.

http://forums.macrumors.com/showthread.php?t=1173618

 

the Otterbox is basically a turtle shell if you are looking to protect your case. that is what this bad boy does. The down side is most battery chargers docks or accessory's won't work with the otterbox unless it's out of the case. or a adapter is used. However if you tend to drop your case allot or like to hike etc. this is the case to have.