No, a bad coil will not drain the battery.
yes it is possible for a gauge to go bad in which you will need to have the cluster repaired or buy a new one
Your starter is incapable of being drained. It is an electric motor. However a bad starter can drain your battery
Bad battery or a parasitic drain
Yes
no
No.
yes
It doesn't actually drain the battery, but without a working alternator to recharge the battery it will only discharge as the car is operated.
You have a bad cell in the battery and a bad cell will drain the other cells. get another battery
YES!My version:A bad relay switch that goes bad can "stick" in the on position and leave what ever it powers on and drain the battery You should be able to see the item that is on.
No, not ever reported in any car