www.enersys.com Publication No. US-RE-IOM-002 January 2012 Page 11
4.2 Storage Interval
PowerSafe
®
RE batteries must be given a freshening charge at maximum storage times shown
in the table below, or when open circuit voltage (“OCV”) approaches 2.06 VPC, whichever
occurs first. Under higher temperature conditions, greater charging frequency is required. Use
date of battery shipment to determine freshening charge requirements.
TABLE 4.1
Average storage
Ambient temperature
Maximum
storage time
20°C 6 months
25°C 5 months
30°C 4 months
40°C 2 months
Storage times exceeding the above may result in plate sulfation, which may adversely affect
electrical performance and expected life.
Give the battery a freshening charge before
the end of the recommended storage interval. See
Section 8 for charging information.
Repeat the freshening charge for each additional storage interval until the battery is installed.
Maximum total storage time before installation is two years from date of shipment from the
factory to the customer. Freshening charges are required a minimum
of every three to six
months during the storage time period, as noted above.
4.3 Advance Preparation
If freshening time interval is likely to be exceeded in storage, make advance preparation to have
an adequate charger available and adjacent to an appropriate AC supply voltage. Positioning of
the cells to accept the temporary intercell connectors is another consideration of advance
planning.
Make every effort to get the battery installed and connected to the charger before the expiration
of the storage period, thereby avoiding the additional labor cost of preliminary freshening
charges.
WARNING
FAILURE TO CHARGE AS NOTED VOIDS THE BATTERY’S WARRANTY.
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