SAFT AMERICA INC.
COMPONENT MAINTENANCE MANUAL
4579
24-31-05
PAGE 107
Jan 30/98
F.
Second Discharge (Capacity Check)
The purpose of this discharge procedure is to verify that the initial battery
maintenance of discharge and charge has corrected any low capacity and/or cell
imbalance that existed in the battery when the initial discharge was performed.
NOTE:
It may be necessary to perform a deep cycle several times to correct a
severe imbalance or loss of capacity.
(1)
Discharge the battery at a rate listed in Figure 103 until the battery reaches
20.0 V.
(2)
Record the time at the start of the discharge and the discharge current.
(3)
Monitor individual cell voltages periodically during the discharge.
(4)
Record the time that the first cell reaches 1.0 V.
NOTE
It is not a cause for concern if a cell goes to zero volts or
reverses polarity during the battery discharge. Simply short out
the cell’s terminals for the remainder of the discharge.
(5)
When the battery terminal voltage reaches 1.0 volts per cell (20.0 V), stop the
discharge, and record the time.
(6)
Interpretation of the Second Discharge (Capacity Check) Results
The results obtained from the Second Discharge will determine the next
procedure per (a) or (b) below.
(a)
Regardless of the results obtained in the first discharge, the battery is in
good condition if:
1
The time required to discharge all cells to 1 volt exceeds the
minimum time listed in Figure 103.
2
The end of charge voltage of all cells was between 1.50 and 1.7
volts.
Therefore, the battery may be placed back into service after it is
charged and the electrolyte level adjusted.