5-12. Individual New Cells
When individual new cells are being prepared for use, be careful when charging. Do not charge individual cells
unless the plastic cell case is externally supported because gas pressure, while charging the unprotected cell,
may cause the cell case to crack. When assembling cells to make up a battery, be sure that all cells were
constructed by the same manufacturer and have the same NSN. To avoid an unbalance in the battery, do not
mix cells made by different manufacturers or having different NSN's to retrofit a battery.
5-13. Fillercap Vent Valve Test
Fabricate the fillercap vent valve tester as shown in figure 5-7. (Use a test cell that has been
flushed clean and is empty of electrolyte. )
Before testing, wash the fillercap thoroughly in detergent and water.
To be used for cleaning, the compressed air source must limit the nozzle pressure
to no more than 29 pounds per square inch gauge PSIG). Goggles must be worn
at all times while cleaning with compressed air.
After washing, rinse the fillercap with clean water and dry with an air blower.
Place the fillercap to be tested on the test cell.
Connect the air regulator to a compressed air outlet and adjust the air pressure until it builds
up in the test cell. The filercap vent valve should open between 2 psi and 10 psi.
if the fillercap vent valve does not open between 2 psi and 10 psi, discard the filercap. If the
filercap vent -valve does open between 2 psi and 10 psi, remove the 0- ring from the fillercap, replace with a
new 0-ring, and return the fillercap to stock for reissue.
Figure 5-7. Fabrication Diagram for Fillercap Vent Valve Tester
5-14. Battery Blanket Electrical Test
The battery blanket electrical test consists of measuring for a low resistance, through the heating element, at
the battery blanket terminal board. An infinite or very high