Lithium-ion batteries have been slowly improving over the last 30 years. Every year they get a little cheaper, a little higher capacity, a little more reliable,

Lithium-ion batteries have been slowly improving over the last 30 years. Every year they get a little cheaper, a little higher capacity, a little more reliable, a little higher discharge, over a few more charge cycles. > In 1994, the cost to manufacture Li-ion in the 18650 cylindrical cell was over US$10 and the capacity was 1,100mAh. In 2001, the price dropped to below $3 while the capacity rose to 1,900mAh. Today, high energy-dense 18650 cells deliver over 3,000mAh and the costs are dropping. http://batteryuniversity.com/learn/article/lithium_based_batteries http://batteryuniversity.com/learn/article/lithium_based_bat... It's not the revolution we may want, but it is the successful application of battery research.