Mercedes S400 BlueHybrid aims to be first to use Li-ion battery

There's a decent chance your average hybrid owner wouldn't know the difference between a lithium-ion and nickel-metal hydride battery if their life depended on it, but we know you -- dear reader -- are not one of those "average" joes / janes. That being the case, you may be interested to know that the 2009-bound S400 BlueHybrid is in prime position to be the world's first production Li-ion hybrid, which will offer up "compact dimensions and far superior performance" compared to existing rivals. M-B goes on to trumpet the technology's "high ampere-hour efficiency, long service life, and great reliability, even at very low temperatures." No word on just how astronomically high this thing will be priced at, but you can expect just shy of 30 miles-per-gallon in mixed driving conditions, for what it's worth.