If this is part of the Smart System subscription then I would pay it. If the battery lock feature is additional, then I would hesitate. But cars charge a fee for similar services, like the OnStar emergency tracking feature on General Motors vehicles. To increase deterrence a self-stick warning label could be placed on the battery, issued upon activation of the service. If Bosch is concerned about owners using expired labels, to avoid the fee renewal, an expiration date could be printed on it.