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What are SLI Batteries and what do we use them for?

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What are SLI Batteries and what do we use them for?

The “SLI” term is most oftenly referred to“Starting, lighting, ignition” battery, which is a type of a lead-acid, rechargeable batterystrong>. SLI batteries main purpose is the automotive industry, however they also have other applications such as the marine industry,lawn and gardening and other heavy duty and other commercial usage. SLI batteries are typically used for short bursts of power, such as starting your engine or running light electrical loads. They also supply additional power when the vehicle’s electrical load exceeds the supply from the charging system (alternator) and act as a voltage stabilizer in the electrical system, evening out voltage spikes and preventing them from damaging other components in the electrical system.

From the inside, SLI batteries are composed of plates off lead and separate plates that are sinked in to an electrolyte solution of sulfuric acid and some water. This substance is what causes a chemical reaction that releases electrons and thus allowing them to flow through conductors in order to produce energy. As the battery discharges, the acid of the electrolyte reacts with the materials of the plates, changing their surface to lead sulfate. When the battery is recharged, the chemical reaction is reversed: the lead sulfate reforms into lead dioxide and lead. They are constructed of many thin plates with thin separators between the plates, and may have a higher specific gravity electrolyte to reduce internal resistance.


Charge and Discharge: In most of the cases the vehicle’s charging system powers the vehicle’s electrical systems and restores charge used from the battery during engine cranking. When plugging a new car battery or recharging a car battery that has been accidentally discharged completely, one of several different methods can be used to charge it. The smartest of these is called “trickle charging”. Other methods include slow-charging and quick-charging, and the last one would be the harshest for the battery. However, it is preferable to use a battery charger whenever possible because the above method will shorten the lifespan of the alternator and gasoline is much more expensive than wall outlet electricity. Simple chargers do not regulate the charge current, and the user needs to stop the process or lower the charge current to prevent overcharging of the battery. More elaborate chargers, in particular those implementing the 3-step charge profile like units manufactured by Pro Charging Systems; charge the car battery fully and safely in a short time without requiring user intervention. The chargers are also commercially available for charging all types of lead-acid batteries.

Changing an Automotive Battery: If you decide to replace your battery by yourself, you should always keep in mind that the first thing to do is to disconnect the negative ground connection in order to avoid accidental short circuits between the battery and thebattery terminal and the vehicle frame. Conversely the positive cable is connected first. Of course, this only applies to negative-earth vehicles – a better rule is to disconnect the earth or ground terminal first, this works whatever the polarity of the system. Another safety factor in the operation is to remove metal bracelets including watches.

Storage:Leaving and SLI Automotive battery discharged for a longer period of time would most probably going to damage the battery, unlike lithium-based batteries. The sulfation would eventually become irreversible with normal charging. Batteries in storage may be monitored and periodically charged, or attached to a “float” charger to retain their capacity. One practical method is to use an inexpensive 24 hour timer that turns a charger on for 30 minutes per day. The batteries should be prepared for storage by charging and cleaning deposits from the posts and it is highly recommendable to be kept in a cool, dry a dray place in order to prevent discharge and corrosion form happening.


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