I don't want to put a damper on the work these guys are doing on ES but if i remember correctly they have been working on that BMS for a long, long time now. I sent them a PM a long, long time ago asking for a cost est, because at that time they thought they were really close to finishing. I nevr heard back from them. I think that was sometime around Xmas. So I hope they succeed and do very well with it but I wouldn't bet the farm on in the near future.