my S7 completely discharged while on the wireless charger.

[AC Question]

I had 15% the night before and went dead after one text message in the morning.

 

[B. Diddy]

Welcome to Android Central! Do you mean it didn't charge overnight? Are you sure it was positioned correctly, and that the wireless charger didn't become unplugged at some point?

 

[CWinkler]

Did you notice if the wireless charger had a blinking LED? I've had that happen a couple times, and when it does it isn't charging the phone. You need to remove the phone, let the charger go dark to reset, and then put the phone back on and check for solid LED. Then you can check to make sure the phone is charging.

 

[Tim1954]

Yes, under certain circumstances, they can actually discharge the battery...

 

[Koalalala]

You may check whether the wireless charging has been connected to the power well or charge it in a horizontal way.

 

[SexyLi]

Remove your phone case and you can change several positives to try it. Sometimes it may connect well.