Is it the property's responsibility that the battery car key is not lost?

Yes If the key of the battery car is not lost, the property is liable for compensation and can be handled by the public security bureau. You can also report the case, and the public security will handle it as a criminal case; However, whether the lost property of electric vehicles should be compensated depends on the actual contract scope. If the residential property collects the management fee, it should protect the owner's electric car.