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What is an SLI battery?

What Exactly Is An SLI Battery And How Does It Work? In this post, we will learn about SLI batteries.

The major purpose of these batteries is to provide power for engine starting, lighting, and ignition (SLI) in vehicles with IC engines, such as cars, buses, lorries, and other heavy road vehicles, as well as motorcycles. Typically, these batteries provide 12 V and are made up of six series-connected lead-acid cells, with a capacity of 100 Ah. Their current energy density is approximately 45 Wh/kg and 75 Wh/dm3. Nowadays, ‘maintenance free’ (MF) SLI batteries have been developed that do not require the addition of water during their normal service life of 2-5 years. The MF versions of the SLI batteries are made of a substance that prevents gassing when charging. The electrolyte in MF batteries is either absorbed by the microporous separators and plates or immobilized by appropriate gelling agents. SLI batteries are now charged by an alternator (AC generator) rather than a dynamo (DC generator). The alternator’s alternating current is converted to direct current via a full-wave bridge rectifier that employs semiconductor diodes. In this configuration, no cutoff is required, and the transistorized voltage controller adjusts the alternator output to match the electrical load and the battery’s level of charge. Under constant-voltage situations, the SLI battery gets charged.

SLI battery in Electric bike. Photo by Himiway Bikes on Unsplash

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