Symptom
FLOAT CHARGING
CURRENT CHECKS
Float current to the
string is zero.
A battery or
connection in the
series string is open.
This can be verified
via the float voltage
check or AC ripple
voltage or impedance
check of the
individual batteries.
Failure to support the
load. If an internal arc
should occur during
discharge, it could ignite
the gasses internal to
to the cell.
If there is a open/loose
connection in the external
conductive path, it could
damage the termination
under load.
Replace the battery with
the open cell or repair
the open/loose external
connection.
Terminal voltage is
marginally below the
minimum voltage
specified for 10 sec.
point.
Battery is perhaps
not fully charged or
is an older battery
that has been in
service and is of
somewhat lower
capacity.
Perhaps reduced
operating time.
Fully recharge
the battery.
AC ripple current
exceeds 5 amperes
per 100 Ah rated
battery capacity
Poor filtering of the
charger.
Excessive AC ripple
current will result in
battery heating, reduced
service life and potential
thermal runaway.
Improve the charger
output filtering.
Possible Causes Possible Result Corrective Actions
HIGH RATE 10 SEC.
LOAD TEST
Float current
exceeds 3.0
milliamperes per
ampere hour of rated
capacity at 77°F
(25°C) at float
voltage.
Batteries are not
yet fully recharged.
Batteries are above
77°F (25°C).
Potentially shorted
cells in battery.
Depending on the
degree,
the battery may be
entering or in
thermal runaway.
Not at 100% of
capability.
Conducive to thermal
runaway.
Conducive to thermal
runaway.
Thermal runaway
results in eventual
meltdown of the
battery and the potential
of hydrogen sulfide
emissions and fire.
Determine the
specific cause and
take necessary
corrective action.
TABLE 1-VRLA Battery Symptoms and Solutions (Continued)
41-7546/0213/CD 17 www.cdtechno.com
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