SLI batteries are used by most people every day and are produced in greater numbers than any other type of lead-acid storage battery. These are used to start automobiles and most other kinds of internal combustion engines. They are not suitable for deep discharge applications, but excel for uses needing a high current for a brief time. They are usually charged in a "partial float" manner, meaning that the battery only receives a float charge while the vehicle is running. A cutaway view of a typical SLI battery is shown in Figure 12. SLI batteries are usually of the flat pasted plate design.

Industrial

Industrial batteries generally have the largest capacity of the three major categories of leadacid batteries. Industrial batteries are used for vehicle traction and stationary applications.

Traction

Traction batteries are used to provide motive power for electric or hybrid vehicles. The major emphasis on traction battery design is the necessity of a high capacity to weight

Figure 12. Cutaway view of a typical battery used for starting, lighting, and ignition (SLI).

and volume ratio, since the vehicle must also carry its power source. Traction batteries are frequently deep cycled and require a fast charging rate for use usually within 24 hours. Typical applications are motive power for fork lifts and electric carts. Traction batteries are usually of the tubular plate design, which performs more favorably during deep cycle operation.