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Joseph, No F00 maybe contact company. Digital Battery Charger Error Code Explanation Chart. Check the attached links,
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The battery voltage is still under 10V (for a 12V battery) or 5V (for a 6V battery) after 2 hours of charging.
Could be caused by trying to charge a 6V battery on a 12V setting or charger, or the battery could be bad, have it checked or replaced.
The charger cannot desulfate
The battery could not be desulfated, have it checked
The battery was unable to reach the "full charged" voltage.
Could be caused by trying to charge a large battery or bank of batteries on too low of a current setting or the battery may have a shorted cell. Try again with a higher current setting or have the battery checked or replaced.
The connections to the battery
The battery is connected backwards. Unplug the charger and reverse the connections to the battery.
The charger was unable to keep the battery fully charged in maintain mode.
The battery won't hold a charge. Could be caused by a drain on the battery or the battery could be bad. Make sure there are no loads on the battery. If there are remove them.
If there are none, have the battery checked or replaced.
The charger detected that the battery may be getting too hot (thermal runaway).
The charger automatically shuts the current off if it detects the battery may be getting too hot or the battery may have a shorted cell. Have the battery checked or replaced.
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Most likely that is not the case. Battery chargers that are not really old have current sensing and dont switch on unless there is a load attached to it. A totally dead battery wont be seen by the device and it wont charge it.