# SLI (Starting Lighting Ignition)

> Conventional starting battery, flooded lead-acid. Not suitable for Start-Stop. Typical service life 3-5 years.

**Categoría**: Technologies
**URL canónica**: https://baterias.com/gb/battery-glossary/sli
**Idioma**: en-GB

## Definition

SLI (Starting Lighting Ignition) is the traditional category of automotive battery: optimised to deliver a high current pulse for 1-3 seconds (engine cranking) and then recharge from the alternator. It is **flooded lead-acid** with maintenance caps (some modern versions are "maintenance-free" but not sealed). It does not tolerate deep cycling (discharges above 30% rapidly degrade the plates). Today it is restricted to vehicles **without Start-Stop systems** (most cars built before 2012, basic city cars, simple commercial vehicles). Typical lifespan 3-5 years. Cheaper than AGM (£40-80 vs £90-200). If your car has Start-Stop, do NOT use SLI — the ECU detects it and disables the system, and the battery will die within months.

## See also

- [Lead-acid battery](https://baterias.com/gb/battery-glossary/lead-acid)
- [EFB (Enhanced Flooded Battery)](https://baterias.com/gb/battery-glossary/efb)
- [AGM (Absorbent Glass Mat)](https://baterias.com/gb/battery-glossary/agm)

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