Schumacher Automatic SP2 - Manual (Page 12)

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Aborted Charge
If charging cannot be completed normally, charging will abort. When
charging aborts, the charger’s output is shut off and the CHARGING
(yellow) LED will blink. To reset after an aborted charge, unplug
the charger from the AC outlet, wait a few moments, then plug it back in.
desulfation Mode
Desulfation could take 10 hours. If desulfation fails, charging will abort
and the CHARGING (yellow) LED will blink.
Completion of Charge
Charge completion is indicated by the CHARGED (green) LED.
When lit, the charger has stopped charging and switched to the
Maintain Mode of operation.
Maintain Mode (Float-Mode Monitoring)
When the CHARGED (green) LED is lit, the charger has started
Maintain Mode. In this mode, the charger keeps the battery fully
charged by delivering a small current when necessary. If the charger
has to provide its maximum maintain current for a continuous 12 hour
period, it will go into Abort Mode (see Aborted Charge section). This
is usually 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.
Maintaining a Battery
The Schumacher SP2 is a battery maintainer that maintains both
6 and 12 volt batteries, keeping them at full charge. It can charge
small batteries and maintain both small and large batteries. If you are
maintaining a fully charged large battery, you are properly utilizing the
battery charger. However, if you use the battery charger to charge a
large battery, such as a marine deep cycle battery, that was not fully
charged, you may lose some of the battery’s capacity. This would
cause the large battery to be unable to hold a charge and become
useless. Therefore, we do not recommend charging a large battery
with this unit.
NOTE: The maintain mode technology utilized in Schumacher
maintainers allows you to safely charge and maintain a healthy
battery for extended periods of time. However, problems with the
battery, electrical problems in your vehicle, improper connections or
other unanticipated conditions could cause excessive current draws.
As such, occasionally monitoring your battery and the charging
process is recommended.