I've noticed a strange charging pattern for my iPhone 6S (64GB, Space Grey, TSCM chip). This morning my phone was on 50% and I charged the phone for 15 minutes. I unplugged and noticed that the phone is still on 50%. When I arrived at work, 10 minutes later, the phone is now on 60%. That's fine for 15 minutes of recharging. But it seems as if the phone is slowly "filling up" the battery. I've never experienced this on my previous iPhones and iPads. Apart from that, the battery life is just fine. Anybody else who've experienced this?