Much like phones have gone away from needing a wall connection, to cordless, to nearly everyone carrying one in their pocket – power tools technology has followed it over the past 10 years. From construction professionals and repair contractors, to factory workers, to do-it-yourselfers, the overall demand has been for more versatile power tools. Manufacturers are meeting the challenge by making today’s tools lighter, longer-lasting, and improving in charging technology.
Battery technology has moved away from nickel-cadmium to Lithium-ion, the tools are becoming faster and lighter. Today’s cordless tools are able to run longer on a single charge, offering superior performance for users than tools produced just a few years ago.
Charging technology continues to evolve, and like power tools themselves, have become increasingly mobile. Battery charging docks can today be installed on workbenches, mounted to walls, or even installed in vehicles.
Advancements in the aforementioned brushless motors is what has driven the rise in power tools. Traditional power tools require more maintenance because of the brushes, whereas power tools with brushless motors are virtually maintenance-free. Brushless motors run more efficiently due to their electronic control, which can also help to control torque and performance, as well as allows users to electronically control speed and power output in certain applications.

http://www.inddist.com/article/2016/03/product-focus-cutting-cord-power-tools