What are SLI Batteries?

Starting/Lighting/Ignition (SLI, a.k.a. cranking)

Everybody is familiar with the SLI batteries that are used for automotive starting and powering vehicular accessories. SLI batteries are designed to produce high power in short bursts but must be constantly recharged (normally with an alternator while driving).

Vehicle starting typically discharges 1%-3% of a healthy SLI battery’s capacity. The automotive SLI battery is not designed for repeated deep discharge where up to 80% of the battery capacity is discharged and then recharged.

If an SLI battery is used for this type of application, its useful service life will be drastically reduced.
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