I was forced to buy this new battery because the original no longer invite could - and after 3 months. But reason for this may be that the car was an extended period with the main switch. Thus, it is likely to have come to such a deep discharge that a shop is no longer possible. In the car is obviously not a protection against it installed.
In early 2013 the children have once again forgotten to turn off the car: this battery is also now broken.