Green Car Congress cites a Deutsche Bank (DB) study predicting more efficient internal combustion engines (ICE) in the short term, with more electric vehicles (EVs) in the long term. DB is optimistic about the future of EVs, observing that laptop batteries (used to power Tesla's Roadster and maybe Audi's forthcoming eTron) have fallen in cost from $2,000 per kWh fifteen years ago to $250 per kWh today. That is equivalent to a CAGR of -13.8% (see graph). If this trend continues, battery costs will be $57/kWh in 2020.
Note the standard laptop battery (cell) is known as an 18650 based on its dimensions: 18mm diameter x 65mm in length.
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