How fast is battery technology improving?

I am asking because, to me, it seems like electric cars may be taking over the vehicle market in the next decade or 2. And I am curious about how batteries might progress in the next decade. Tesla already makes cars that can go 300 miles on a charge and recharge in like 45 minutes. Not to mention having 400+... show more I am asking because, to me, it seems like electric cars may be taking over the vehicle market in the next decade or 2. And I am curious about how batteries might progress in the next decade. Tesla already makes cars that can go 300 miles on a charge and recharge in like 45 minutes. Not to mention having 400+ horsepower and acceleration unrivaled by just about any gasoline car. The only real problem is the price. It's certainly not bad for such a high quality EV. But it's still not exactly in the price range of your average citizen. Is it safe to say that in the next decade, batteries will get considerably better and cheaper? I hope so.
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