I just go the IP4 and I can already tell that i am going to be fighting the constant fast drain of battery issues (even if that many apps are not being used). I wanted a case that is slim and has a backup battery included with it (i dont want the backup battery to stick out but to be part of the slim case). This may not be even out there but I was hoping to throw it out there in the hopes there might be. I want it to be slim to avoid the clunkiness of it in your pocket. But most importantly i want that backup battery along with it as well.