A load handling device is disclosed for lifting and moving one or more containers stacked in a storage system having a grid framework structure supporting a pathway arranged in a grid pattern above stacks 1of containers, the load handling device including a vehicle body housing a driving; a lifting device including a lifting drive assembly and a grabber, wherein the lifting drive assembly and/or the driving mechanism includes at least one motor forming an electrical load; a rechargeable energy storage for providing energy to power the electrical load; and a charging system including a first part for charging the rechargeable energy storage including a charge receiving element on the vehicle body, and a second part for delivering energy to the electrical load; wherein the second part includes a DC/DC converter to supply a predetermined DC voltage across the electrical load.