Question here.. In the past, the magsafe (amber / green light) provide us with a rough gauge when battery is fully charged. Now that we are using USB-C how do we know when it is fully charged especially if it is turn off? I have also ordered USB-A to USB-C cable, would it damage the laptop if we use the iPhone plug (5W) to charge? I believe it will charge slower than the original power adapter thats all right? Apologies if these questions have been answered before as i am unable to find the threads.