Last week GM had a media introduction to its 2009 model line, in which Bob Lutz announced that the development of the new lithium-ion battery “is progressing nicely”. Lutz also said that GM had chosen a supplier, but hasn’t announced it yet. The lithium-ion battery technology is the key player of the electric car, the Chevrolet Volt, which GM promises to have out by 2010. The Volt will be able to drive for 40 miles on one charge before the gas-powered generator on board will be needed to extend its range.

Currently, lithium-ion batteries are commonly available in laptop computers and cell phones, but GM has taken it upon them to test and adapt the technology in the rough environment of automobiles. However, Lutz claims that no obstacles have gotten in the way so far, and that in fact the batteries are performing flawlessly.

These experimental batteries are being tested for temperature extremes and durability in a way that portable electronics never have to be subjected. Their thermal performance is under heavy scrutiny because of the technology’s history of having a tendency to overheat in some electronic applications.

The unanswered question is of longevity, according to Lutz. It is impossible to know at this time what the battery life will be. This would mean that an auto warranty would be essential for consumers to protect themselves against unknown expenses.