What is it? More details are emerging for the Volt: It will be a small four-passnger, four-door hatchback based on GM's global small-car platform. Its batteries will likely be based on one of two new technologies, lithium nano-phosphate or lithium ion magnesium cells, that aren't prone to thermal runaway (which could result in the batteries and nearby components catching fire). GM says that they can be recharged from any home 110- or 220-volt outlet in eight and 16 hours respectively. GM calls the Volt an "extended-range electric vehicle" rather than a "plug-in hybrid" to distinguish it from vehicles like the next generation Toyota Prius which will also plug in.
What's new or notable? Unlike the upcoming Prius, the Volt is a series hybrid that must be plugged in. The gas engine may not even start on some trips.
CR's take: Theoretically, plug-in hybrids could greatly reduce oil consumption and the infrastructure to charge them is already in place. Still, the battery technology still needs much more development before vehicles like the Volt are viable. Consumers shouldn't regard GM's target roll-out date as rock solid.
When will it be available? GM is plans to introduce the Volt in late 2010.
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