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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.

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Q: Why does a car battery go flat if the car is not used often?
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