Symptom
VISUAL BATTERY
CHECKS
High current
recharge.
High charging
voltage.
Shorted cells.
This combination can
lead to thermal
runaway.
Limit recharge current.
Reduce to within
specifications.
Replace shorted cells
and evaluate total string.
Cover/container
crack.
Handling or impact
damage.
Cell dryout or ground
fault. Potential internal
gas ignition.
Replace damaged unit.
Burned area on
container.
Crack in container
wicking electrolyte
to grounded rack,
etc.
Ground fault.
Could result in personal
hazard due conductive
path to rack, etc.
Could result in smoke or
a battery fire.
Could result in a thermal
runaway.
Clear the ground fault
and replace defective
unit. Evaluate balance
of the string.
Permanently
deformed (swollen)
container.
Thermal runaway
possibly caused by
high temperature
environment,
overcharging,
excessively
high recharge current,
shorted cells or a
ground fault or a
combination of
these items.
Could result in the
emission of hydrogen
sulfide which is
detectable as a rotten
egg odor, battery fire
and inability to support
the load.
Replace the battery
system and correct the
items leading to the
thermal runaway
condition.
Possible Causes Possible Result Corrective Actions
Cover/container
explosion.
Ignition of cell
internal gasses due
to external source,
fusing of internal
conductive path, or
internal spark due to
shorting. This potential
exists for batteries not
maintained and
continued in service
beyond useful life.
Personal injury and
equipment damage at
time of explosion.
Failure to support load.
Replace damaged
unit and evaluate the
balance of string.
TABLE 1-VRLA Battery Symptoms and Solutions (Continued)
41-7546/0213/CD 13 www.cdtechno.com
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