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5. Position yourself and the free end of the cable (attached to the NEG battery terminal) as far away from the
battery as the cable will allow. Then, WHILE FACING AWAY FROM THE BATTERY, connect the NEGATIVE
charger clamp to the free end of the cable.
Charging Instructions
Note: To save energy, the charger is designed to enter idle mode if no buttons are pressed for three minutes. In idle
mode, the charger’s display will turn off. When the charger is in this mode, any button press will wake the display
and subsequent button presses will function as normal.
1. With AC cord unplugged, connect to the battery/vehicle to be charged as per the instructions in the
previous section, “Connecting to Batteries...”
2. Plug the unit’s AC power cord into the AC power source.
3. Toggle the Mode Selector Switch until the desired charge rate is indicated.
4. Press the START button to begin charging. The Charging LED will light to indicate charging is in progress.
Once the battery has reached full charge, the Charge Complete LED will light and the charger will turn off.
NOTE: If unsafe charging conditions are present, the charger will enter a warning mode, light the red fault
LED and will not commence charging until the error is resolved. The possible warning codes are as follows:
- er1 – This error occurs immediately upon pressing the start button. This error indicates that the charger
does not detect proper battery polarity. Check all connections to ensure that you are properly connected
to the battery and that, therefore, the fault is due to the battery’s state of charge being below the threshold
(~1.5V) to sense polarity. Once a proper connection is confirmed, hold the START button down for 3 seconds
(release within 6 seconds) to override er1 and commence charging.
NOTE: Overriding er1 disables numerous safety features of the charger. It is the operator’s responsibility to
ensure that they are properly connected to the battery/vehicle, that the battery to be charged is a 12 Volt
battery and that the only hindrance to commencing a normal charge cycle is that the battery’s state of charge
is too low for its polarity to be recognized by the charger. All adverse consequences resulting from overriding
er1 are the responsibility of the operator.
- er2 – This error usually occurs after the charger has charged the battery for a period of time. This error
indicates that the battery is not accepting charging current in a manner typical of a healthy battery. Usually,
this error is caused when either the battery’s voltage does not rise in a reasonable amount of time or the
battery cannot hold its charge after a short period of rest. Both of these conditions are indicative of a
compromised battery. er2 cannot be overridden.
- er3 - This error occurs immediately upon pressing the start button. This error indicates that the battery
under charge has an open circuit voltage above the normal range for a 12 Volt battery (>15.5V). This is usually
caused by a compromised/shorted battery or a battery with a nominal voltage above 12 Volts. In either case,
the battery should not be charged by this charger. er3 cannot be overridden.
5. When charging is complete, unplug the charger’s AC power cord from the AC power source.
6. Disconnect the charger clamp NOT attached directly to the battery first and DO NOT allow the clamp to
touch anything. Then, disconnect the charger clamp attached to the battery terminal.
