Cell pillars and connectors
(sintered microporous PVC)
Planté positive plates
(constructed of pure lead)
Lead-Acid Storage Batteries
times of low power demand. Stationary batteries are also used for backup emergency
power, telecommunications equipment, and uninterruptible power supplies. Stationary
batteries are manufactured in a variety of plate designs. An example of a stationary
battery used for backup power is shown in Figure 13.
Portable lead-acid batteries are usually of the sealed type constructed similarly to that
depicted in Figure 14. Their operation cannot usually be described as cyclic or float, but is
somewhere in-between. Batteries in this category may be frequently deep cycled or remain
unused for a relatively long time. Typical applications are portable tools, toys, lighting and
emergency lighting, radio equipment, and alarm systems. Most portable batteries may be
recharged to 8090% of their original capacity in less than an hour using a constant-voltage
Figure 13. Typical stationary battery used for backup power.