If the machine's maximum working time (battery display status red) is not used at least 2 to 3 times per week, the machine must be used at least once or twice per
month so that the batteries are sufficiently discharged to be able to activate the automatic shutoff function. This can be achieved either through normal use or with
the machine stationary, e.g. by switching on the vacuum motor. The batteries should be fully recharged afterwards. For this reason, warranty claims arising from the
failure to follow this rule cannot be honored. The basic warranty period is 1 year.