I have the expower ultra thin card and in the instructions it tells you to remove the copper screening sticker from inside the original back plate as it causes extra heat when charging. Its a bitch to peel off as well. Gets warm but not enough to bend my phone by any means and it charges fine through my defender case there's no noticeable bulge in the back plate either. If i want to put it in water i'll throw an otterbox preserver on it.
Currently Stock on until theres a way to reset knox or warranty expires.
Country: United Kingdom
Version: Android 4.4.2
Product Code: BTU