Review on 2-Pack Fast QI Wireless Charging Receiver Adapter Patches for iPhone 7/7 Plus/6/6 Plus/6s/6s Plus/5/5s/5c - Ultra-Thin Design, 1000mAh, 5W Compatible with All Wireless Chargers by Kelly Martinez

This thing charges so slowly that my 2800mah battery is still not charging after almost a WEEK of being on one Qi charger for at least 16 hours a day and on different Qi chargers at the same time. half an amp at 5V, so the charger draws 2.5W of power. The phone maker says that 18W should charge the phone in an hour, so theoretically it should get 15% of its charge in an hour at 2.5W, even maybe 10% assuming some inefficiency. I left it on the charger for 8 hours, the phone hardly charges more than when it started and gets very hot. Other QI receivers I've had haven't had this issue.