The Verge has a fantastic profile on Anker, the accessory company created by a former Google software engineer, which is also the most popular brand of portable battery packs on Amazon (and Amazon.ca):
Steven Yang quit his job at Google in the summer of 2011 to build the products he felt the world needed: a line of reasonably priced accessories that would be better than the ones you could buy from Apple and other big-name brands. These accessories — batteries, cables, chargers — would solve our most persistent gadget problem by letting us stay powered on at all times. There were just a few problems: Yang knew nothing about starting a company, building consumer electronics, or selling products.
How did Anker gets its name? The company is named after the German word for ship anchor.
