Chinese EV maker Nio (NIO) and battery giant Contemporary Amperex Technology Limited (CATL) have disclosed a partnership to build a vast

CATL and Nio have signed an agreement to support each other by establishing a nationwide battery-swapping network in China that use both Nio's swap tech and CATL's Choco-swap technology. CATL's Choco-swap offers batteries for subcompact to midsized cars ranging from 42 kWh to 70 kWh.

The world’s largest battery manufacturer, Contemporary Amperex Technology Co. Ltd., has agreed to invest up to 2.5 billion yuan ($346 million) in building out a battery-swapping network across China in collaboration with electric vehicle maker Nio Inc.