![]() ![]() Explosions during engine start-up are typically associated with corroded or dirty battery posts. Gas explosions can occur at the negative electrode where hydrogen gas can build up due to blocked battery vents or a poorly ventilated setting, combined with an ignition source. Modern SLI batteries are lead-acid type, using six series-connected cells to provide a nominal 12-volt system (in most passenger vehicles and light trucks), or twelve cells for a 24-volt system in heavy trucks or earth-moving equipment, for example. While the engine is running most of the power is provided by the alternator, which includes a voltage regulator to keep the output between 13.5 and 14.5 V. It is also a stabilizer, evening out potentially damaging voltage spikes. Īs well as starting the engine, an SLI battery supplies the extra power necessary when the vehicle's electrical requirements exceed the supply from the charging system. SLI batteries are not designed for deep discharging, and a full discharge can reduce the battery's lifespan. They are sometimes referred to as "SLI batteries" for this reason, for starting, lighting and ignition. For this reason, automotive batteries are designed to deliver maximum current for a short period of time. Typically, starting uses less than three percent of the battery capacity. Once the engine is running, power for the car's electrical systems is still supplied by the battery, with the alternator charging the battery as demands increase or decrease.īattery in modern cars Gasoline and diesel engine Its main purpose is to provide an electric current to the electric-powered starting motor, which in turn starts the chemically-powered internal combustion engine that actually propels the vehicle. A typical 12 V, 40 Ah lead-acid car batteryĪn automotive battery or car battery is a rechargeable battery that is used to start a motor vehicle. For batteries that power electric vehicles, see Electric vehicle battery. This article is about batteries that start engines and power accessories. ![]()
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