Lucent Technologies Round Cell Batteries
7 - 4 Operation and Maintenance Issue 3 December 1999
Check and Record Individual Cells for Crystals
Interval Perform this procedure quarterly.
Guidelines • Throughout the life of a battery plant, the absence of lead-sulfate
crystals indicates that the cells are floating properly and maintaining
a full state of charge. Corrective action for crystalline cells is not
usually an urgent item since the presence of lead-sulfate crystals
usually does not mean that the battery or cell is incapable of
providing adequate capacity.
• A crystalline cell will suffer an immediate loss of approximately 5
percent of its rated capacity. Any further decay in capacity will
depend upon the precise cause for the crystalline condition.
An easy way to assess the ability of a crystalline cell to deliver
capacity is to make a specific gravity reading. If the specific gravity
is within ±0.01 of the nameplate value, the reduction in cell capacity
will be approximately 5 percent. Concern for the ability of a
crystalline cell to deliver reasonable capacity should begin when the
specific gravity decreases by 0.03 of the nameplate value.
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