Schumacher Battery Charger SC1339 Manual

The Schumacher SC1339 is a fully automatic battery charger and maintainer designed for 6V and 12V lead-acid batteries, including standard, AGM, gel-cell, and deep-cycle batteries. It features microprocessor-controlled charging, automatic voltage detection, float-mode monitoring, and reverse hook-up protection. Below are key sections for safety, features, operation, specifications, and troubleshooting.

1. Features at a Glance 2. Safety Instructions 3. Getting Started 4. Specifications 5. Controls and Indicators 6. Charging Procedure 7. Maintenance Mode 8. Care & Storage 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: Charger unit, Battery clamps (red/black), AC power cord, LED indicator panel.

Feature	Description
Microprocessor Control	Automatically selects optimal charge rate
Automatic Voltage Detection	Detects 6V or 12V battery automatically
Float Mode Monitoring	Maintains battery at full charge without overcharging
Reverse Polarity Protection	Alerts if clamps are connected incorrectly
Spark Proof Technology	Reduces risk of sparking when connecting
Multi-Battery Support	Charges standard, AGM, gel-cell, and deep-cycle
LED Status Indicators	Shows charging, maintenance, and fault conditions
Fully Automatic Operation	No manual settings required for basic charging
Compact Design	Lightweight and portable for easy storage
Thermal Protection	Prevents overheating during extended use

Safety Instructions

Read all instructions before use. Charger contains electrical parts that can cause serious injury.

Use in well-ventilated area to prevent gas explosion.
Wear eye protection when working near batteries.
Do not charge frozen or damaged batteries.
Keep charger dry and away from flammable materials.
Connect to AC power only after attaching battery clamps.

WARNING! Risk of explosive gases. Battery can explode if charger is improperly connected. Always connect positive (red) clamp to positive terminal first.

Getting Started

Unpack and inspect contents. Ensure battery is in safe, stable location.

Prepare battery: Clean terminals and remove corrosion if present.
Check electrolyte levels (non-sealed batteries only).
Ensure battery voltage matches charger capability (6V or 12V).
Connect charger to battery before plugging into AC outlet.

CAUTION! Do not disconnect clamps while charger is powered on. Always unplug AC cord first.

Specifications

Model: SC1339
Input Voltage: 120V AC, 60Hz
Output Voltage: 6V/12V automatic selection
Charge Rate: 1.5A (trickle charge/maintain)
Battery Types: Standard, AGM, Gel-Cell, Deep-Cycle (flooded)
Charging Modes: Bulk, Absorption, Float/Maintenance
Protections: Reverse polarity, short circuit, overheat, spark proof
Indicators: LED (Power, Charging, Maintenance, Fault)
Cord Length: 3-foot battery cables, 6-foot AC cord
Operating Temp: 32°F to 104°F (0°C to 40°C)
Dimensions: 7.5" x 3.5" x 2.5"
Weight: 2.2 lbs

Controls and Indicators

Front Panel LED Indicators:

POWER (Green): Lit when AC power connected.
CHARGING (Red): Lit during active charging phase.
MAINTENANCE (Green): Lit when battery is fully charged and in float mode.
FAULT (Red): Flashes for reverse connection, bad battery, or other fault.

Automatic Operation: No user controls. Charger automatically detects battery voltage and selects charge mode.

Charging Procedure

For 6V or 12V lead-acid batteries.

Ensure charger is unplugged from AC outlet.
Connect red clamp to positive (+) battery terminal.
Connect black clamp to negative (-) battery terminal or vehicle chassis.
Plug charger into 120V AC outlet.
POWER LED will light. CHARGING LED will light during charge cycle.
When battery is fully charged, CHARGING LED turns off and MAINTENANCE LED lights.
To disconnect: Unplug AC cord first, then remove black clamp, then red clamp.

Tip: For deeply discharged batteries, charger may take several hours to complete charging cycle.

Maintenance Mode

After full charge, charger switches to float/maintenance mode.

MAINTENANCE LED indicates charger is monitoring battery voltage.
Charger supplies small current as needed to maintain full charge.
Can be left connected indefinitely for seasonal storage.
Automatically prevents overcharging.

Note: For long-term storage, check battery and charger periodically.

Care & Storage

Unplug and disconnect before cleaning. Store in dry location.

Wipe exterior with dry cloth only.
Do not use liquids or solvents.
Inspect cables regularly for damage.
Store in original packaging if possible.

CAUTION! Do not expose to rain or moisture. Keep away from heat sources.

Regulatory Information

Troubleshooting

Symptom	Possible Cause	Corrective Action
No LEDs light	No AC power	Check outlet; ensure charger is plugged in
FAULT LED flashing	Reverse connection	Disconnect and reconnect clamps correctly
FAULT LED flashing	Bad battery	Test battery voltage; replace if below 2V
CHARGING LED stays on	Battery deeply discharged	Allow more time (up to 24 hours)
CHARGING LED never comes on	Battery already charged	MAINTENANCE LED should light if battery full
Charger gets warm	Normal operation	Ensure ventilation; thermal protection will activate if needed
Sparks when connecting	Spark proof not engaged	Connect black clamp first to chassis, not battery terminal

Reset: Unplug AC cord, disconnect battery clamps, wait 30 seconds, then reconnect.

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