The battery should not smoke when the key is turned; it should not do anything other than deliver electrical current. If the battery "smokes", the cause for this would be an excessive electrical current conducting through either a substance on the surface of the battery or the electrolytic solution inside, which would result from a malfunction of the battery (such as a cracked or broken area or a manufacturing error, etc.). In either situation, the excessive current throught the substance heats and burns the substance, and you then would see the burned vapor as the "smoking" action.
Dead battery or corroded battery connections.
Dead battery or a bad connection to the battery.
you have corroded battery cable connector feel for heat when trying to start the bad cable will get hot or smoke
Battery dead
BAttery?, starter? ignition switch?
No, You do not need a key fob to start a car. When starting a car, you put the key in the ignition and turn. Power comes from car battery, not from the key fob battery!
just unplug the negative side of the battery.
Disconnect one cable of your battery and turn the car key to ignition position two times, connects your battery and turn the car key to ignition.
Weak battery Loose or corroded battery cables
Dead battery or dirty/loose battery connections.
Put the key in the door and turn.
get a new car