When properly maintained, two to four years on average. (Top)

Yes. Two full years from the date of purchase. One year for the battery. (Top)

Under normal circumstances, a unit exposed to rain will not be damaged, although we would not advise putting the mower into operation during a severe storm. However, should it begin raining while it is operating; there is no problem for the Robomow^®. Several Robomow^® models are equipped with a rain sensor and you may choose not to allow operation while it is raining. It is prohibited to wash Robomow^® with a water hose, particularly from the underside. (Top)

No, the charger is equipped with a float control, allowing the charger to remain connected at all times without risk of damage. In fact, this is the recommended procedure between uses and for winter storage. (Top)

This depends on the model you are using, size of garden and frequency of operation, but typical figures are very low, no more than 10 for an entire year of operation. (Top)