Automotive Lead Batteries: Widely used in cars for ignition and power supply. 

Automotive lead batteries are the most common type of battery used in traditional internal combustion engine vehicles. Often called SLI batteries (for starting, lighting, and ignition), their primary job is to deliver a massive surge of current to crank the engine's starter motor. This initial burst of power is essential for a vehicle to start. Once the engine is running, the alternator takes over to power the vehicle's electrical system and recharge the battery.

These batteries are designed for short, powerful discharges, not for deep, continuous power delivery. Fully discharging an automotive lead battery, such as by leaving the headlights on overnight, can significantly shorten its lifespan. They're a reliable and cost-effective choice for their intended purpose, providing the necessary jolt to get things going.