Schumacher Automatic SP1 User Manual

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Insert the 12V accessory plug into the 12V accessory outlet.

Route the power cord from the charger through the vehicle’s

open window.
Plug the charger power cord into a grounded 120V AC electrical

wall outlet.

Automatic Charging Mode

When an Automatic Charge is performed, the charger switches to the

Maintain Mode (see below) automatically after the battery is charged.

For a battery with a starting voltage under 0.2 volts, use a manual

charger to pre-charge the battery for five minutes to get additional

voltage into the battery.
Aborted Charge

If charging cannot be completed normally, charging will abort. When

charging aborts, the charger’s output is shut off and the CHARGING

LED will blink. To reset after an aborted charge, unplug the charger

from the AC outlet, wait a few moments and plug it back in.
desulfation Mode

Desulfation could take 8 to 10 hours. If desulfation fails, charging will

abort and the CHARGING LED will blink.
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 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 SP1 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 will be properly utilizing

the battery charger. However, if you were to use this battery charger