If you're looking for exact numbers, I don't have them, but you could easily light an entire pack without an issue while the radio is on. Neither drain a noticeable amount of battery.
Yes it can, especially on older cars that aren't equipped with a battery saver program on board.
It will probably keep transmitting and place a small drain on the battery.
Sorry, no - there is no shut off switch for the cigarette lighter. It is wired so a person can use the cigarette lighter without having to use the ignition key to switch to the accessory position or start the vehicle.
If the car is left sitting for a long time and not running, yes. In some cars the cigarette lighter wont work unless the car is on for this reason.
If the car is on (Ignition is on, engine is running) then no. Nothing should drain the battery when the car is running, there is a device called an alternator with a belt that usually goes around the crankshaft that transforms the mechanical energy into electrical energy. As long as you have the car running, the battery should not die. If so, you have a mechanical problem.
The age of the battery may have something to do with it. An old battery will sometimes lose its ability to hold a charge when idle. Also, if you completely drain the battery's charge on a sealed wet-cell battery (the type sold on all cars after the 1970's) by accidentally leaving the lights on, it will never hold a full charge again. Another common cause is in the cigarette lighter. If a gum wrapper or some other foreign object gets in the cigarette lighter socket, it can slowly drain the battery. The lighting element itself can also be the culprit if it is used a lot and becomes worn.
It depends on whether or not the power port is on when you pull out the key.
If it is lit up, then yes it will draw on the battery.
As long as the charger is connected to its power source it will take a small amount of power from that source (even if the phone is not connected to it), regardless of whether it is an AC "wall wart" charger or a cigarette lighter charger (although normally turning the car ignition off turns the cigarette lighter outlet off, so if it drains the car battery the car ignition switch may have a problem). If the phone is connected to the charger it may continue to take extra power even with the phone fully charged (I have a Tracfone that will drain my battery powerpack completely (if not connected to a charger its internal battery drains completely in less than 2 days even if I'm not using it at all -- this phone has something wrong in it). The real issue is now fast the charger is draining the battery. BTW, I am assuming above that you mean an external battery that the charger is connected to, not the internal battery of the cell phone itself (if this is the case I would say the phone is seriously defective as this would normally not be possible).
No, a bad coil will not drain the battery.
Depends on if it drained while you were driving or ran down while it was parked overnight. If the battery runs down while you're driving the vehicle then more than likely the alternator is defective. If the battery drains while the vehicle is parked then the problem is either a dead cell in the battery or a light is on somewhere on the vehicle. Could be a under hood light, trunk, glovebox, dome, or even the brake lights. It can also be a relay that is stuck.
Yes you sure can. It is a myth that sitting a battery on concrete will drain the battery. It will not drain it at all.