The Tesla Battery Pack Challenge

The Tesla Battery Pack Challenge: "Tesla is betting on the improvement in Li-ion technology (currently estimated to be 8% per year) to continue on and eventually get the battery replacement cost down to around $12K. It's not clear if that is Tesla's projected cost, or the replacement cost; they've been very tight lipped on battery replacement costs. Provided Li-ion technology can maintain an 8% annual level of improvement, it will take about 18 years for the wholesale cost of the battery pack to approach $12K."