A working equipment comprising: - a hydraulically movable arm arrangement for a crane, - at least one electric motor arranged to be powered by a battery system , at least one hydraulic pump arranged to be operated by the electric motor , and a pump controller configured to control the electric motor and/or the hydraulic pump , and to monitor the current consumption of the at least one electric motor ; - a plurality of actuators , arranged to be operated by hydraulic fluid discharged from the at least one hydraulic pump and further arranged to move the movable arm arrangement during a working assignment, and - an equipment controller configured to control movement of the movable arm arrangement by generating operating signals controlling the flow and/or pressure of hydraulic fluid to the plurality of actuators , and to receive a battery condition signal comprising a presently available current limit from the battery system , wherein the equipment controller is further configured to monitor the required flow of hydraulic fluid from the at least one pump needed to move the movable arm arrangement in accordance with the operating signals, characterized in that the equipment controller is arranged to determine a maximum flow limit of the hydraulic fluid from the at least one pump in dependence of a comparison of the current limit received from the battery system and the monitored current consumption by the pump controller , wherein, the equipment controller is configured to compare said determined maximum flow limit with the required flow of hydraulic fluid from the at least one pump needed to move the movable arm arrangement in accordance with the operating signals, and if the result of the comparison does not fulfil at least one rule of a set of fluid control rules, the equipment controller is configured to adapt the operating signals to reduce the flow of hydraulic fluid to at least one of the plurality of actuators according to at least one rule of a set of adaptation rules, such that at least one rule of said set of fluid control rules is fulfilled. - a hydraulically movable arm arrangement for a crane, - at least one electric motor arranged to be powered by a battery system , at least one hydraulic pump arranged to be operated by the electric motor , and a pump controller configured to control the electric motor and/or the hydraulic pump , and to monitor the current consumption of the at least one electric motor ; - a plurality of actuators , arranged to be operated by hydraulic fluid discharged from the at least one hydraulic pump and further arranged to move the movable arm arrangement during a working assignment, and - an equipment controller configured to control movement of the movable arm arrangement by generating operating signals controlling the flow and/or pressure of hydraulic fluid to the plurality of actuators , and to receive a battery condition signal comprising a presently available current limit from the battery system , wherein the equipment controller is further configured to monitor the required flow of hydraulic fluid from the at least one pump needed to move the movable arm arrangement in accordance with the operating signals, characterized in that the equipment controller is arranged to determine a maximum flow limit of the hydraulic fluid from the at least one pump in dependence of a comparison of the current limit received from the battery system and the monitored current consumption by the pump controller , <EOS>