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a. Batteries shall be of the flooded lead-acid type. All cells shall be completely
assembled and shall be shipped in accordance with Section 7.
In the next paragraph, enter the desired positive-plate type. Plate type can be pure lead, lead calcium or lead
antimony. Some manufacturers also indicate a lead-selenium plate type. This plate is actually a lead-antimony
type with very low selenium content. The only pure-lead plate available from U.S. suppliers at the time of this
writing is the AT&T round cell, which may have to be oversized from a capacity standpoint to provide the high
current rate.
b. Batteries shall be of the [pure-lead] [lead-calcium] [lead-antimony]
[lead-selenium] alloy type, with positive and negative plates of Seller's
standard design. Active material for the positive plates shall be lead dioxide,
and for the negative plates shall be sponge lead. Active materials shall be
retained in structures designed to retard corrosion and withstand over-
charging. Negative plates shall have a life equal to or greater than that of
positive plates.
Cell features.
a. Each cell element shall be in a fire-retardant, high-impact transparent plastic
[jar and] cover. The jar and cover material shall have a limiting oxygen index
(LOI) of at least 28%.
b. Cement or otherwise fasten cell covers to containers to form a leakproof and
gas-tight seal, and fit with sprayproof vents. The vent plug shall be the
flame-arrester type.
c. Size jars to prevent compression of the plates, and to allow space at the
bottom for sediment that may accumulate during the life of the battery, yet
prevent contact between the sediment and the plates. Design cells to
accommodate plate growth such that the jar and cover will not crack.
d. Where applicable, mark all four sides of each cell jar with high and low
electrolyte-level lines.
Enter the appropriate cell voltages below. The float voltage depends on the plate alloy and specific gravity
selected. Refer to the battery manufacturer's recommended values. The equalization voltage and the minimum
discharge voltage are normally determined from the maximum and minimum input voltage ratings of the
UPS/connected system.
e. All cells shall be suitable for float at [2.25 V] [
V] per cell and equalize at
V] per cell. The minimum discharge voltage shall be [1.75 V]
[2.33 V] [
V] per cell.
Support plates so that no undue stress is placed on the jar or cover during
the life of the battery. Negative and positive plates shall be matched.
Reinforce the plates as needed to retain their shape and maintain the low

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