E T X S E R I E S L I T H I U M B A T T E R I E S
4
The table below shows the most common fault conditions and possible causes.
LED Light
Voltage
Possible Cause
Recommended Action
Slow Flashing
(5s on/5s off)
Less than
12.8V
Battery over-discharged
(due to faulty charging
system)
Charge battery. Once charged, the
light will stop flashing.
Slow Flashing
(5s on/5s off)
Less than
13.2V
Weak or failing cell
Charge battery. If voltage drops
below 13.2V within a few days,
discontinue use.
Slow Flashing
(5s on/5s off)
(> 1 hour time
period)
13.2V-14.6V
Weak or failing cell
Discontinue use. If in flight, this is
not an immediate issue unless it is
in conjunction with a charging
system failure.
Slow Flashing
(5s on/5s off)
Greater than
15.2V
Over-charging (due to
faulty charging system)
If in flight, shutoff charging system
immediately
. Aircraft over-voltage
protection is required if alternator
charging system is greater than 20
amps (i.e. over voltage crowbar
circuit)
Slow Flashing
(5s on/5s off)
(< 30 min. time
period)
13.2V
–
14.6V
Cell to cell charge levels
are not balanced
May come on briefly during
periods of high current charging
until the cells are automatically
balanced. Try charging with a
plugin charger, like an Optimate
Lithium charger.
Solid Light
Any voltage
BMS electronic issue
Discontinue use. If in flight, this is
not an immediate issue unless it is
in conjunction with a charging
system failure.
Solid Light that
turns off after
3 minutes
Any voltage
Short Circuit protection
was activated
Nothing needs to be done.
Short Flashing
(2s on/2s off)
Any voltage
High battery temperature
(> 65
°C / 150°F)
Let battery cool down prior to
cranking or charging.
A sustained fault can indicate a serious issue with the battery or vehicle charging system that requires
immediate attention. Discontinue use until the issue is resolved and the battery no longer indicates
a fault.
Continued use of a faulty battery can result in a cell rupture, the release of flammable vapors,
smoke and or a fire.
