Schumacher SC1308 Battery Charger Manual

The Schumacher SC1308 is a fully automatic battery charger and maintainer designed for 6V and 12V lead-acid batteries, including standard, AGM, gel-cell, and deep-cycle types. It features microprocessor-controlled charging, automatic voltage detection, multi-stage charging (bulk, absorption, float/maintenance), reverse hook-up protection, and spark-proof technology. Below are key sections for safety, features, operation, specifications, and troubleshooting.

1. Features at a Glance 2. Safety Instructions 3. First-Time Setup & Operation 4. Specifications 5. Controls and Indicators 6. Charging Procedures 7. Maintenance Mode 8. Care & Storage 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: Microprocessor control unit, Charging clamps (red/black), AC power cord, LED status indicators.

Feature	Description
Automatic Voltage Detection	Detects 6V or 12V battery automatically
Multi-Stage Charging	Bulk, Absorption, Float/Maintenance for optimal battery health
Battery Type Support	Standard, AGM, Gel-Cell, Deep-Cycle
Reverse Hook-up Protection	Prevents damage if clamps are connected incorrectly
Spark-Proof Technology	Safe connection; reduces risk of sparks
Fully Automatic Operation	Set and forget; switches to maintenance when full
LED Status Indicators	Shows charging, maintenance, fault conditions
Compact Design	Lightweight and portable for garage or storage

Safety Instructions

Read all instructions before use. For lead-acid batteries only.

Work in a well-ventilated area; keep away from sparks, flames, and smoking.
Wear eye protection and protective clothing.
Ensure charger is unplugged from AC outlet before connecting/disconnecting clamps.
Connect red clamp (+) to positive battery terminal, black clamp (-) to negative terminal or vehicle chassis.
Do not charge a frozen battery or one with damaged casing.

WARNING! Risk of explosive gases. Do not use near batteries during charging. Keep children and pets away.

First-Time Setup & Operation

Plug charger into standard 120V AC outlet.

Prepare battery: Ensure battery terminals are clean and free of corrosion.
Connect clamps: FIRST connect red clamp to positive (+) terminal. THEN connect black clamp to negative (-) terminal or unpainted metal on chassis.
Plug in charger: Connect AC power cord to outlet. Charger will automatically detect battery voltage and begin charging.
Monitor LEDs: Refer to indicator lights for charging status.
Disconnect: When charging is complete, unplug AC cord first, then remove black clamp, then red clamp.

CAUTION! Always connect/disconnect in the correct order to prevent sparks.

Specifications

Model: SC1308
Input Voltage: 120V AC, 60Hz
Output Voltage: 6V / 12V Automatic
Charging Current: 1.5A (maximum)
Battery Compatibility: 6V and 12V Lead-Acid (Standard, AGM, Gel, Deep-Cycle)
Charging Stages: 3-Stage (Bulk, Absorption, Float)
Protections: Reverse Polarity, Short Circuit, Overcharge
Dimensions: Compact, portable design
Operating Temperature: Standard indoor/garage conditions

Controls and Indicators

Unit features LED indicator lights to show status.

LED Indicators:

POWER (Green): Lit when unit is plugged into AC outlet and receiving power.
CHARGING (Red): Lit during bulk and absorption charging stages.
MAINTENANCE (Green): Lit when battery is fully charged and unit is in float/maintenance mode.
FAULT (Red Flashing): Indicates reverse connection, bad battery, or other fault condition.

The charger is fully automatic; no manual controls or settings are required for standard operation.

Charging Procedures

For standard charging of a discharged battery.

Ensure area is ventilated and battery is at room temperature.
Connect clamps in correct order (Red first to +, Black to -).
Plug charger into wall outlet. POWER LED will light.
CHARGING LED will light red. Charger will automatically select correct voltage and begin multi-stage charging.
When battery reaches full charge, CHARGING LED will turn off and MAINTENANCE LED will light green.
Charger will now maintain the battery at optimal voltage indefinitely until disconnected.
To disconnect, unplug AC cord first, then remove clamps (Black first, then Red).

Tip: For deeply discharged batteries, charging may take several hours to a full day.

Maintenance Mode

After full charge, the SC1308 automatically switches to Float/Maintenance mode. This supplies a small, steady voltage to keep the battery at 100% charge without overcharging. It is safe to leave the charger connected to a battery in maintenance mode for extended periods (weeks or months), making it ideal for seasonal vehicles, boats, or lawn equipment.

Care & Storage

Unplug and disconnect from battery before cleaning. Wipe exterior with a dry cloth. Store in a cool, dry place. Keep clamps clean and free of corrosion.

CAUTION! Do not immerse in water or use liquid cleaners. Inspect cords and clamps periodically for damage.

Regulatory Information

This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference. Copyright and trademarks are property of Schumacher Electric Corp. For technical support or to locate a service center, visit www.schumacherelectric.com or contact 1-800-621-5485.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No LED lights when plugged in	No AC power / Faulty outlet	Check wall outlet; ensure charger is firmly plugged in. Try a different outlet.
FAULT LED flashing	Reverse connection / Bad battery	Unplug charger. Disconnect clamps. Ensure correct connection order (Red to +, Black to -). Battery may be damaged or unusable.
CHARGING LED stays on for days	Very large or deeply discharged battery	This is normal. Allow charging to continue. If battery does not accept charge after 48 hours, it may be defective.
Charger gets warm	Normal operation	Some warmth is normal during charging. Ensure vents are not blocked.
Battery not holding charge	Battery may be at end of life	The charger maintains a healthy battery but cannot revive a dead or sulfated one. Test battery with a load tester.

Reset: Unplug charger from AC and battery for 2 minutes to reset microprocessor.

Service: 1-800-621-5485; www.schumacherelectric.com