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Hybrids have them, where it's a combined starter, alternator, traction motor, and regenerative brake. Hybrids usually run at 36-200V and have a high voltage deep cycle battery that is a large part of why hybrids are expensive. However, it's possible to do those things at 12V, and some auto parts suppliers (Bosch comes to mind) have developed them. I presume the reason 12V belt ISG's aren't popular is that they do in fact cost more than the conventional method, and the benefits aren't worth the cost.
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