Most devices are powered by rechargeable lithium-ion batteries, and most notably by the 18650 size batteries of the type used in cars manufactured by Tesla, the price of which fell by 80% between 2011 and 2017.
Most devices are powered by rechargeable lithium-ion batteries, and most notably by the 18650 size batteries of the type used in cars manufactured by Tesla controlled by complex battery management systems. The price of lithium batteries fell by 80% between 2011 and 2017.