Very picky Charger

I am relatively disappointed with this product because it is very finicky about the positioning of the phone (here a Lumia 830), played a millimeter. Like it positioned right or wrong, there is always the charging icon in the Windows Phone tray. But one realizes that morning if it was misplaced: or is it 100% expected, or it's + 2% charge for all night, despite the indicator that tells us that the phone is charging!
In short, this Fatboy disappointed, better not take a wider wireless charger.