I tried to research this a bit. There have been a few models which have gotten an upgraded battery, so we should start seeing these options. The new Nissan Lea

I tried to research this a bit. There have been a few models which have gotten an upgraded battery, so we should start seeing these options. The new Nissan Leaf has a larger battery pack, but it's not backward compatible. https://transportevolved.com/2015/09/11/confirmed-30-kwh-nissan-leaf-battery-packs-incompatible-with-older-nissan-leafs/ https://transportevolved.com/2015/09/11/confirmed-30-kwh-nis... But they do have a batter replacement option which has better thermal management. http://insideevs.com/breaking-nissan-prices-leaf-battery-replacement-5499-new-packs-heat-durable/ http://insideevs.com/breaking-nissan-prices-leaf-battery-rep... I wasn't able to find out anything about the Renault Zoe, or Kia Soul (new model isn't out yet though). But our dealership did tell us that he expects there to be battery upgrades available for the Kia Soul, and this also seems to reflect what others on the forums have heard. But he did say it might be 3rd party options. Supposedly you can upgrade individual cells. So the picture isn't clear yet. But I think once the market reaches a certain size, there will at least be 3rd party options.