Lawsuit: Apple poaching auto engineers to build battery division

New York Times:

Electric-car battery maker A123 Systems has sued Apple Inc for poaching top engineers to build a large-scale battery division, according to a court filing that offered further evidence that the iPhone maker may be developing a car.

Apple has been poaching engineers with deep expertise in car systems, including from Tesla Inc, and talking with industry experts and automakers with the ultimate aim of learning how to make its own electric car, an auto industry source said last week.

The lawsuit is interesting, but more notable is the evidence this lends to the possibility of an Apple car of some sort. If Apple is building an automotive software platform, a Car OS, why would they need battery expertise?