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Extensive BMW expertise goes into the special packaging and assembly of the battery. In all, the assembly process comprises 400 operations. The battery casing protects the lithium-ion cells and at the same time improves the rigidity of the vehicle as a whole. After the battery cells have been packaged into modules, the assembly process begins. The modules are lifted one by one into an aluminium tray, then manually connected in series using a communication cable harness. Finally, the battery top cover and bottom cover are fitted and the finished batteries undergo an end-of-line test. The battery is designed in such a way that individual battery modules can be easily swapped for repair purposes.