Full article: http://www.autobloggreen.com/2007/08...hybrid-system/
The second generation BAS system will evolve to provide significantly more power assist and recapture a lot more kinetic energy. To that end, the current nickel metal hydride battery will be supplanted by a lithium ion battery to provide significantly more energy capacity in an even smaller package. The alternator-starter will be able to provide more power which will allow the use of a smaller, more efficient engine while maintaining performance. The smaller battery will also allow the system to be packaged in far more vehicles where it can be offered as an option.