User Manual

ETX SERIES LITHIUM BATTERIES
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The ETX series lithium battery has built-in over-discharge protection circuitry, which
automatically disconnects the battery if the voltage drops below 11.5 volts (98% discharged).
When the battery is “disconnected”, the voltage at the battery terminal should be near zero
volts if the battery still has a load on it. If the battery is disconnected from the load it will
automatically reconnect. For a drained battery, simply connect the battery to a charger to
restore charge (charge with 2A for 20-30 minutes), and then re-check the voltage. If the
voltage is 12.8V or greater, the battery should be ok and can be fully charged. Not all
chargers will charge a battery that displays zero volts, so check our website for a list of
compatible chargers, and specifically chargers that will work for recharging an “over-
discharged” battery for which the BMS’s over-discharge protection has activated and won’t
reset automatically if the load is removed (remove load by removing the positive or negative
cables from the battery). This condition is sometimes referred to as a BMS reset.
Problem
The battery seems to suddenly stop working.
Possible Causes and Solutions
A lithium battery voltage remains relatively constant while discharging, but when the battery
runs out of power it does so abruptly. Try charging the battery for 30-60 minutes at 1 – 2
Amps. If the battery still does not work, or the measured voltage is less than 12.5V, the
battery may be permanently damaged and needs to be replaced.
Problem
The battery does not hold a charge.
Possible Causes and Solutions
There may be a problem with the vehicle charging system: While the charging system is in
operation, it should output approximately 13.9 -14.6 volts. If the voltage is below this level,
the charging system needs to be repaired.
The vehicle electrical system may have a short circuit or current drain: Measure the current
out of the battery when the vehicle and all vehicle accessories are shutoff. The current
reading should be near zero (less than 3mA). If not, the vehicle has an electrical problem
that needs to be fixed.
The terminals on the battery are not tightly connected: Tighten the terminal connections.
A cell may be defective: there is no fix for this except replacing the battery.
The battery may have reached the end of its life: Replace the battery.
Problem
The vehicle does not want to start in cold weather.
Possible Causes and Solutions
Lithium batteries internal resistance increases as the temperature decreases, so the battery
will put out fewer amps in cold weather (less than 32 deg F). You may need a larger Ah /
cranking amp battery.
Problem
How do I know if my battery charger is working?
Possible Causes and Solutions
The newer fully automatic chargers need to be hooked up to a battery before they will
output any voltage. This is primarily a safety feature that prevents spark when hooked up,