Schumacher Automatic SP1 - Manual (Page 13)

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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.
CALCULATiNG CHARGE TiME 13.
Use the following tables to more accurately determine the time it will
take to bring a battery to full charge.
MAiNTENANCE iNSTRUCTiONS 14.
After use and before performing maintenance, unplug and 14.1
disconnect the battery charger (see sections 6, 7 and 8).
Use a dry cloth to wipe all battery corrosion and other dirt or oil
14.2
from the battery clips, cords, and the charger case.
Ensure that all of the charger components are in place and in
14.3
good working condition, for example, the plastic boots on the
battery clips.
Battery Condition
2 Amp, 12 Volt Battery 50% Discharged 100% Discharged
Ampere Hour Battery
Capacity
Approximate Average Charge Time in
Hours
10 3.2 6.2
12 4.0 7.5
20 6.4 12.4