![Tesla Model S lithium-ion battery pack in rolling chassis [photo: Martin Gillet via Flickr]](http://images.hgmsites.net/tmb/tesla-model-s-lithium-ion-battery-pack-in-rolling-chassis-photo-martin-gillet-via-flickr_100481091_t.gif)
Perhaps the biggest question in buyers' minds over electric cars is how long the batteries will last. Most new-car buyers have mobile phones whose batteries have only lasted a couple of years, perhaps less. Even as electric-car battery packs are warranted against outright failure for eight or 10 years, how much degradation should owners... Tesla Model S battery life: what the data show so far
Perhaps the biggest question in buyers' minds over electric cars is how long the batteries will last. Most new-car buyers have mobile phones whose batteries have only lasted a couple of years, perhaps less. Even as electric-car battery packs are warranted against outright failure for eight or 10 years, how much degradation should owners...