Storage
Manual_Grid_Power_FNC_en_V3_0
25
7.1.
Storage of Filled and Charged (FC) Cells
Note
The storage period of the batteries should not exceed three month after manufacturing and
delivery from the factory.
If the foreseeable storage period exceed three month, discharge the batteries as described
below.
The battery system prepared in this way can be stored for three years.
The manufacturing date of the grid|power FNC
®
cells is stamped on the top of each battery cell.
Each cell has a 9-digit cell code on top of the cell lid. The last four digits indicate the week and
year of production.
Example:
xxxxx2610 => production week 26; Production year 2010
Steps to prepare the battery system for storage:
1. Remove the plug of each grid|power FNC
®
cell.
Note - valid for grid|power FNC
®
VR cells
Remove a VR plug carefully. It is recommended to use the HOPPECKE plug opener (Mat. No.
4142500125)
Alternatively use a small, slot screwdriver. Grab the plug with your hand and slowly twist and
vertically pull out the plug from the cell opening.
Wear personal protective equipment because grid|power FNC
®
VR cells operate under pressure.
Removing a VR plug can release electrolyte spray.
2. Discharge the batteries by using a charging/discharging device with nominal current I
5
(nominal capacity C
5
/ 5h) until the battery voltage has dropped to 1.0 V per cell.
3. Seal each grid|power FNC
®
cells with a yellow transport plug.
Note
Filled and charged (FC) grid|power FNC
®
cells prepared in this manner can be stored up to three
years.
After three years, a recondition charge is necessary, see
10.7 Reconditioning on page 48
Note
If you want to put the stored grid|power FNC
®
cells into operation, you have to charge the cells
for recommissioning. For information, refer to
9.2 Commissioning of Unfilled and Uncharged (UU)
and Filled and uncharged (FU) grid|power FNC® Cells on page 36
