Why is lead acid battery used instead of Lithium-ion battery in Tata Tiago EV and other EV vehicles?

Because the lead-acid unit in an EV is usually the small 12V auxiliary battery, not the main drive battery. In Tata EVs, the traction battery that moves the car is lithium-ion, while the 12V battery handles low-voltage functions such as electronics, control modules, locks and startup of the high-vol