A Smart has lithium batteries? I though it was more like a motorcycle battery to start that little 3 banger.
I thought it was a hybrid. This sort of mixup happens when the only reason to pay attention to them is to keep from squashing them. That temptation is over-powering sometimes.
Available as an all-electric, or as the more common 3-cyl.
Gas version actually gets worse mpg than Prius or Fit or some other small cars!