I have an S8 with the New Wireless charger, using the plug and cable that came with the phone. I'm having issues with the phone charging on the pad.
Last night I placed the phone on the pad with 22% charge, it beeped, the blue light came on on the charger and the fan started. This morning the phone was at 12%!. Both the blue light and the fan on charger were on all night, I woke up 3 times and checked each time.
A few days ago it took over 8 hours to go from 5% to 85% and the charger kept cutting in and out throughout the night, but no beeps from the phone to identfy disconnections/reconnections.
Two nights ago it charged fine, blue light when I put the phone on the charger and green light in the morning.
I do have a leather case on the phone, but I never had this issue with my S7 edge and the older version of the charging pad.
I would always recomend removing from the case even a ultra thin case for wireless charging I have 3 chargers (wireless) a pad, stand (both samsung) and a anker pad. I have 2 cases a otterbox strada case (leather case) and a basic tpu case the leather one is a no go on all my pads as it does make the connection but very little charge the tpu case works well but makes the case and phone get hot, the best I have found is to use it without a case at all for the best result in charging.
what is the point of having a wireless charger if you have to take the case off of it each time you want to charge it? It is much easier to just plug in the charging cable rather than removing the case. I think Samsung has some work to do on either the charger or phone to make the wireless system work while the phone is in its case.