After an indeterminate / apparently no regularity following time often or almost always the megane no longer starts. So the car can not start the next day after it was driven about 60 km, 120 km or more on the previous day or after 1 to 2 months no more, in which he was thus unused / undripped, but also 60 km, 120 km or more before the parking or otherwise a period of time. It should be said that the power is to be consumed after the car is switched off, although the car should not be able to consume electricity, since the power supply should be completely interrupted with the car closed from the outside. For example, car radio, the navigator operated by the cigarette lighter no longer works with the key card and the door opened, because the power supply is apparently interrupted, so it is as it should be. Some workshops say the consumption It is extremely improbable or not possible to find it (by measuring the perhaps existing current flow over a few days in the parked car), especially since it does not always use electricity after parking, i.e. sometimes after parking, is active or not. Other workshops think that the consumer can be found in this way. After each parking, the cable removes from the negative pole of the battery, so that the car is immediately connected to the cable. The old battery was replaced by a new one, probably even bigger, before something had changed in the behaviour. How could one best proceed to solve the problem?