Schumacher Automatic XM1-5 - Manual (Page 11)

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Aborted Charge
If charging can not be completed normally, charging will abort. When
charging aborts, the charger’s output is shut off, and the CHARGING
LED will flash. To reset after an aborted charge, either disconnect
the battery or unplug the charger.
Completion of Charge
Charge completion is indicated by the CHARGED LED. When lit,
the charger has stopped charging and switched to the Maintain Mode
of operation.
Maintain Mode (Float-Mode Monitoring)
When the CHARGED 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 XM1-5 is a battery maintainer, and 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 will properly utilize 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’s
maintainers allows you to safely charge and maintain a healthy battery
for extended periods of time. However, problems with your 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.