yes, it is
well, yes. It conducts electricity from one lead to the other. Shape has no effect on the battery other than how its made. So you must be thinking of a simple battery cell process, otherwise this would be a silly question. In a simple battery cell, even if your battery was as thin as a piece of paper it would still work but just with very little electricity. So it would have to be as thin as a shadow, meaning two dimensional instead of three dimensional to not conduct electricity.
there wont be any electriity once it is flat!!
Electricity doesn't actually flow "through" anything, it travels on the exterior or surface of the conductor. Assuming the "flat" you are talking about is a conductor for a circuit board. The way a/c electricity travels is best described like an analog sound wave with a crest and a peak, d/c is an always on or off with little to no fluctuations. Electricity can also arc or jump if you will such as lightning where no conductor is needed just a positive and negative.
if you leave any lights on in the car you may cause you a flat battery. if you leave any lights on in the car you may cause you a flat battery.
How to unlock vu with flat battery
The electric field strength just outside the flat surface of a conductor is zero.
Because Electricity can't be "Stored" as such, it is constant. So wether the car is unused or even something as simple as a mobile phone battery, the voltage is still constant, so it looses power slowly (of course). Until it inevitably "Goes flat" as you put it. - but its often that if any battery is left to long without use or charged. The "effectivness" of the battery begins to deteriate, so eventually. (After a Fairly long time) that battery would become unusableb indeffinetly, regardless of the user , atempting to charge it. In addition if the battery runs flat is just a couple of days then something is on drawing power from the battery or the battery has a dead cell.
If a new battery goes flat the most common fault would be a fualty alternator or regulator on the alternator. The alternator is belt driven by your engine and generates electricity to re-charge your battery. A brand new battery may last a few days but without re-charge from the alternator it will eventually go flat.
Yes...it will not have the same capacity afterwards. Yes. Everytime you run an auto battery down completely you shorten the life of the battery. It is not designed to be run flat as a deep cell battery is.
If the battery goes dead flat the door will still unlock manually with the key.
Flat rate = fixed.
The battery light will be illuminated on the dashboard and later the battery will go flat as it is not getting charged Garages can check this for you if your battery is frequently getting flat.