I got a S7 a few months ago, and have recently had problems with it not fast charging with the original USB-C cable and a power adapter I'd previously confirmed did fast charge. I'm trying to figure out if the problem is with the power adapter, or something with the watch/WatchOS itself.
One example is that yesterday, in 32 minutes it went from 34% to only 52%. I removed and put it back on the charger, and it charged much more quickly (52% to 85% in 20 minutes), more what I'd expect from fast charging.
My understanding is that optimized charging is supposed to learn from your daily charging habits to decide when to charge from 80% up to 100%. My assumption was that the phone should always fast charge to 80%, then optimized charging decides how fast it will charge beyond that.
But I'm wondering if I'm mistaken, and optimized charging may cause it to not fast charge to 80%, depending on however it's learned your usage.
Does anyone know how these 2 features are supposed to work in conjunction with each other?