China's biggest EV maker, BYD, has roiled the market over the past few months by offering its "God's Eye" driver-assistance system as a standard feature at no extra cost across its lineup.

Chinese auto giant BYD continued to outpace Tesla in the first quarter, reporting a doubling in net profit on robust growth in its electric-vehicle business.

BYD Co.’s net income in the first quarter jumped to 9.15 billion yuan ($1.3 billion), overtaking Tesla Inc. on another key metric and signaling a robust start to the year for China’s no. 1 selling car brand.