The technical advances of the computer industry in terms of transistor size, memory density and cost are unique to say the least. To expect any other technology to advance as rapidly, expecially battery technology, for any reason is wishfull thinking at best.

When Gordon Moore made his famous observation in 1965 (http://www.intel.com/research/silicon/mooreslaw.h tm/) almost nobody believed it would hold true for more than a few years. The fact that it has held true for some 40 years is simply a miracle.