Schumacher SE-1-12S Owner's Manual page 17

Completion of Charge
Charge completion is indicated by the CHARGED LED. When lit, the
charger has 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 battery voltage drops
below a preset level, the charger will go back into Charge Mode until
the battery voltage returns to the full charge level, at which point the
charger will return to Maintain Mode.
NOTE: The charger automatically switches between Charge Mode
and Maintain Mode as necessary. The CHARGED LED will cycle
on when the battery is at full charge and off when the voltage drops
below a preset level and the charger goes into Charge Mode. This
cycle will continue, and the CHARGED LED will stay on for longer
periods of time as the battery becomes more fully charged.
Maintaining a Battery
The Schumacher SE-1-12S and SF-1-12S are battery maintainers
that maintain 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 be
properly utilizing the battery charger. However, if you were to use
this 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 the vehicle, improper connections or
other unanticipated conditions could cause excessive current draws.
As such, occasionally monitoring your battery and the charging
process is recommended.
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