Credit: AnandTech
http://www.anandtech.com/show/7134/a-look-at-samsungs-galaxy-s-4-qi-wireless-charging-pad-review / wireless charging cell mobile smart smartphone phone phones includes support Samsung’s Galaxy S 4 S4 S3 S III SGS4 review unit Samsung wireless charging accessory kit Qi compatible wireless charging pad battery back wireless charging accessory simple remove stock battery back, snap new one plug wireless charging pad into Samsung charger originally shipped with phone wireless charging pad requires 2 Amp charger Samsung supplies SGS4 charging charger includes 1.2 V Volt signaling across D+ D- pins which signals 2 amp tablet-class tablet class compatible charging Samsung devices charging pad normal BC 1.2 compatible charger won’t work specification stipulates 1.5 amp delivery on its dedicated charging port charging pad SGS4 Qi compliant variety of wireless charging pads implement standard charge device test testing tester tested Energizer dual position Qi charger wireless charging back worked as expected downside with the wireless charging back add noticeably thickness SGS4 calipers measured an increase thickness just over 1.7 mm wireless charging back attached instead stock standard Battery Cover Stock Battery Cover SGS4 Wireless Charging Battery Cover huge difference noticeable added thickness front vertex of the camera thickest part of the SGS4 adds a bit of protection S 4 /
