This has been a tumultuous part of the business. They started selling the battery to Think! then pulled back that portion of the business but then there was a deal maybe with Mercedes then there was a Daimler Smart Car deal and now are quitely selling them again. We recently found that Mercedes is making their own batteries so that may kill our best guess who their customer may be. This is from Tesla's Facebook: Millions. Sad to think that the battery biz (or at least the company diversification) was what made some heads roll during the first Tesla "re-org" -surely salt in the wounds of those ex-Teslites now. So who is/are their battery customer(s) now?