Battery Charger SC1322

Schumacher Automatic Battery Charger SC1322

The Schumacher SC1322 Automatic Battery Charger is designed to charge and maintain compatible 6V and 12V lead-acid batteries. It features automatic voltage detection, a 10A charging output for 12V batteries, a 2A output for 6V batteries, and a Battery Type button for selecting standard (STD) or Absorbed Glass Mat (AGM) batteries.

The SC1322 automatically detects the connected battery voltage and manages the charging process. After the battery reaches full charge, the charger switches to Maintain mode to help keep it fully charged.

The charger also includes automatic start, battery desulfation, reverse-polarity protection, charging fault detection, and LED status indicators. It can charge batteries installed in vehicles or batteries removed from vehicles when the appropriate safety and connection procedures are followed.

Product Features

The Schumacher SC1322 includes the following features:

• Automatic charging for compatible 6V and 12V lead-acid batteries.
• 10A DC charging output for 12V batteries.
• 2A DC charging output for 6V batteries.
• Automatic battery voltage detection.
• Battery Type button with STD and AGM settings.
• Automatic charging operation.
• Automatic start when a compatible battery is properly connected.
• Automatic transition to Maintain mode after charging.
• Float Mode Monitoring for keeping batteries fully charged.
• Battery desulfation process.
• Reverse-polarity indication.
• Battery fault detection.
• Automatic charging shutdown when a battery cannot be charged normally.
• Red Clamps Reversed/Bad Battery LED.
• Yellow/orange Charging LED.
• Green Charged/Maintaining LED.
• Battery clamps and integrated charging cables.

Technical Specifications

The French-language section lists a recommended 12V battery capacity of 44–75Ah, while the English and Spanish sections specify 44–68Ah.

Battery Compatibility

The SC1322 is intended for charging compatible 6V and 12V rechargeable lead-acid batteries.

Supported Battery Types

Standard (STD) Batteries

Standard batteries are commonly used in cars, trucks, and motorcycles.

These batteries may have removable vent caps and are often identified as low-maintenance or maintenance-free.

Standard starting batteries are designed to provide short bursts of electrical energy for starting engines.

They typically have a larger number of thinner plates than batteries designed for deep-cycle use.

The STD setting should be selected when charging a compatible standard lead-acid battery.

AGM Batteries

AGM stands for Absorbed Glass Mat.

AGM batteries contain electrolyte held in absorbent glass mat material close to the active material of the battery plates.

These batteries are a type of sealed valve-regulated lead-acid battery.

Common applications include:

• High-performance engine starting.
• Powersports vehicles.
• Deep-cycle applications.
• Solar energy systems.
• Battery storage systems.

The AGM setting should be selected when charging a compatible AGM battery.

Recommended Battery Capacities

Battery Types That Must Not Be Charged

The SC1322 must not be used to charge household dry-cell batteries.

These batteries may burst during charging and cause personal injury or property damage.

Never attempt to charge a frozen battery.

Parts and Components

The SC1322 includes a charger housing, battery charging cables, clamps, power cord, Battery Type button, and LED status indicators.

Main Components

Control Panel and Button Functions

The Schumacher SC1322 uses a Battery Type button and three LED indicators to control and monitor charging.

Battery Type Button

The Battery Type button selects the correct battery type.

Selecting STD Battery Type

Select STD when charging a compatible standard lead-acid battery.

These batteries are commonly used for starting vehicles and are often labeled low-maintenance or maintenance-free.

Selecting AGM Battery Type

Select AGM when charging a compatible AGM lead-acid battery.

AGM batteries are commonly used in vehicles, powersports equipment, and applications requiring sealed batteries.

LED Indicator Guide

The SC1322 uses three LED indicators to show charging status and battery problems.

SC1322 LED Indicator Meanings

Flashing Red LED – Reversed Battery Clamps

A flashing red Clamps Reversed/Bad Battery LED indicates that the battery clamps have been connected with reversed polarity.

Disconnect the charger from AC power before correcting the battery connections.

Solid Red LED – Bad Battery

A solid red LED indicates that the charger has detected a battery problem.

Possible causes include:

• Battery voltage remaining too low after charging.
• Failed desulfation.
• Insufficient charging progress.
• Battery overheating.
• A battery that cannot accept or retain a charge.
• Excessive current demand during Maintain mode.

The battery should be checked and replaced if necessary.

Solid Yellow/Orange Charging LED

The yellow/orange Charging LED illuminates while the charger is charging the battery.

Solid Green Charged/Maintaining LED

The green Charged/Maintaining LED illuminates when the battery reaches full charge.

A solid green LED indicates that the charger has switched to Maintain mode.

All Three LEDs Illuminate Briefly

When the charger is first connected to an AC outlet, all three LEDs may illuminate for approximately two seconds and then turn off.

This is normal operation.

Important Safety Instructions

WARNING: Risk of explosive gases, fire, electric shock, and serious injury.

Lead-acid batteries produce explosive gases during normal operation. The charger must be used according to the safety instructions provided by Schumacher and the battery manufacturer.

General Safety Precautions

• Read the safety and operating instructions before using the charger.
• Do not allow children to use the charger.
• Do not expose the charger to rain or snow.
• Use only attachments recommended or sold by the charger manufacturer.
• Disconnect the charger by pulling the plug rather than the power cord.
• Do not use the charger with a damaged cord or plug.
• Do not use the charger if it has been dropped, struck, or otherwise damaged.
• Do not disassemble the charger.
• Have repairs performed by qualified service personnel.
• Disconnect the charger from AC power before maintenance or cleaning.
• Avoid using an extension cord unless absolutely necessary.

Battery Explosion Prevention

Lead-acid batteries generate explosive gases during normal operation.

To reduce the risk of an explosion:

• Never smoke near a battery or engine.
• Keep sparks and open flames away from the battery.
• Do not allow the battery clamps to touch each other.
• Avoid dropping metal tools onto batteries.
• Keep the charging area well ventilated.
• Follow all battery manufacturer safety instructions.
• Never charge a frozen battery.

Personal Safety Precautions

When working near a lead-acid battery:

1. Have another person close enough to provide assistance if necessary.
2. Wear complete eye protection.
3. Wear protective clothing.
4. Keep clean water and soap nearby.
5. Remove rings, bracelets, necklaces, watches, and other metal jewelry.
6. Avoid touching the eyes while handling batteries.

A lead-acid battery can produce enough short-circuit current to heat or weld metal jewelry, causing severe burns.

Battery Acid Safety

Battery acid can cause serious injuries.

If battery acid contacts skin or clothing, wash the affected area immediately with soap and water.

If battery acid enters the eyes, flush with cold running water for at least 10 minutes and obtain immediate medical attention.

Vehicle Starting Warning

IMPORTANT: Do not start a vehicle while the SC1322 is connected to an AC electrical outlet.

Starting the vehicle while the charger remains connected to AC power may damage the charger.

California Safety Warning

The manufacturer states that this product contains one or more chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Preparing the Battery for Charging

Prepare the battery before connecting the SC1322.

Battery Preparation Instructions

1. Turn off all electrical accessories in the vehicle.
2. If the battery must be removed from the vehicle, disconnect its grounded terminal first.
3. Make sure the charging area is well ventilated.
4. Clean the battery terminals.
5. Prevent battery corrosion from contacting the eyes.
6. For batteries with removable cell caps, add distilled water until the electrolyte reaches the level specified by the battery manufacturer.
7. Do not overfill the battery.
8. Follow the manufacturer’s recharging instructions for sealed or valve-regulated lead-acid batteries.
9. Determine whether the battery is rated for 6V or 12V.
10. Follow the battery manufacturer’s recommended charging precautions and charging rates.

Charger Placement Instructions

Proper charger placement reduces exposure to battery gases and electrical hazards.

Positioning the Charger

• Position the charger as far from the battery as the DC charging cables allow.
• Never place the charger directly above the battery.
• Prevent battery acid from dripping onto the charger.
• Do not operate the charger in an enclosed area without proper ventilation.
• Keep ventilation openings unobstructed.
• Never place a battery on top of the charger.

AC Power and Grounding Requirements

The Schumacher SC1322 operates from a nominal 120V AC electrical circuit.

The charger must be connected to a properly installed and grounded electrical outlet.

Grounding Instructions

1. Connect the charger to a grounded 120V AC outlet.
2. Make sure the electrical plug fits the outlet correctly.
3. Do not modify the supplied power cord or plug.
4. Do not use the charger with an ungrounded electrical system.
5. If the plug does not fit the outlet, have a suitable grounded outlet installed by a qualified electrician.

An improper electrical connection can cause electric shock or electrocution.

Adapter Plug Restrictions

Under the Canadian regulations identified in the manual, adapter plugs are not permitted.

Adapter plugs are also not recommended for use with this charger in the United States.

Extension Cord Requirements

An extension cord should only be used when necessary.

The cord must be properly wired, in good electrical condition, and adequately rated for the charger’s electrical requirements.

Recommended Extension Cord Sizes

The extension cord plug must have the same number, size, and shape of pins as the charger plug.

Before First Use

The Schumacher SC1322 requires minimal preparation before operation.

Initial Setup Instructions

1. Remove all cord wraps.
2. Uncoil the AC power cord.
3. Uncoil the DC charging cables.
4. Inspect the charger for physical damage.
5. Inspect the battery clamps and cables.
6. Prepare the battery for charging.
7. Place the charger in a suitable location.
8. Keep the charger disconnected from AC power while attaching the battery clamps.
9. Connect the battery using the correct connection procedure.
10. Connect the charger to a grounded electrical outlet.
11. Select the appropriate battery type.

The charger uses automatic voltage detection to identify the connected battery voltage.

How to Connect the SC1322 to a Battery in a Vehicle

The connection procedure depends on whether the vehicle uses a negative-ground or positive-ground electrical system.

WARNING: A spark near the battery may cause an explosion.

Connecting to a Negative-Ground Vehicle

Most vehicles use a negative-ground electrical system.

1. Turn off the vehicle ignition and electrical accessories.
2. Make sure the charger is disconnected from AC power.
3. Identify the positive and negative battery terminals.
4. Connect the red positive clamp to the positive battery terminal.
5. Connect the black negative clamp to a heavy-gauge metal part of the vehicle chassis or engine block away from the battery.
6. Keep the chassis clamp away from fuel lines, the carburetor, and sheet-metal body parts.
7. Make sure both clamps are securely connected.

Connecting to a Positive-Ground Vehicle

For vehicles with a positive-ground electrical system:

1. Make sure the charger is disconnected from AC power.
2. Identify the positive and negative battery terminals.
3. Connect the black negative clamp to the negative battery terminal.
4. Connect the red positive clamp to a heavy-gauge metal part of the chassis or engine block away from the battery.
5. Avoid connecting the chassis clamp to fuel lines, the carburetor, or sheet-metal body parts.

Disconnecting the Charger from a Vehicle

When charging is complete:

1. Disconnect the charger from AC power.
2. Remove the clamp connected to the vehicle chassis or engine block.
3. Remove the clamp connected to the battery terminal.

How to Connect the SC1322 to a Battery Outside the Vehicle

When charging a battery outside a vehicle, an additional insulated battery cable must be used.

Required Battery Cable

Battery Connection Instructions

1. Place the battery in a well-ventilated area.
2. Identify the positive and negative battery terminals.
3. Attach a minimum 24-inch-long, 6 AWG insulated battery cable to the negative battery terminal.
4. Connect the red positive charger clamp to the positive battery terminal.
5. Position the free end of the insulated battery cable as far from the battery as possible.
6. Connect the black negative charger clamp to the free end of the insulated cable.
7. Do not face the battery while making the final connection.

Disconnecting the Charger

When charging is complete:

1. Disconnect the charger from AC power.
2. Remove the black negative clamp from the insulated cable.
3. Remove the red positive clamp from the battery.
4. Disconnect the additional insulated battery cable.

Charging Marine Batteries

A marine battery must be removed from the boat and charged on shore.

Charging a battery aboard a boat requires equipment specifically designed for marine use.

How to Charge a Battery in a Vehicle

The SC1322 charges a compatible battery automatically after the battery is properly connected and its type has been selected.

Vehicle Battery Charging Instructions

1. Turn off all vehicle electrical accessories.
2. Keep the vehicle hood open.
3. Clean the battery terminals.
4. Place the charger on a dry, nonflammable surface.
5. Position the AC and DC cables away from fan blades, belts, pulleys, and other moving parts.
6. Connect the battery clamps using the appropriate vehicle grounding procedure.
7. Connect the charger to a grounded electrical outlet.
8. Select the correct battery type using the Battery Type button.
9. Allow the charger to detect the battery voltage automatically.
10. The yellow/orange Charging LED illuminates while charging.
11. Wait until the green Charged/Maintaining LED illuminates.
12. Disconnect the charger from AC power.
13. Remove the clamp connected to the vehicle chassis.
14. Remove the clamp connected to the battery terminal.

How to Charge a Battery Outside the Vehicle

The SC1322 can also charge a compatible battery that has been removed from a vehicle.

Battery Charging Instructions

1. Place the battery in a well-ventilated area.
2. Clean the battery terminals.
3. Connect the charger according to the outside-vehicle battery connection procedure.
4. Plug the charger into a grounded electrical outlet.
5. Select the correct battery type.
6. Allow automatic charging to begin.
7. Monitor the charging status using the LED indicators.
8. Wait until the green Charged/Maintaining LED illuminates.
9. Disconnect the charger from AC power.
10. Remove the negative charging connection.
11. Remove the positive charging connection.

Automatic Voltage Detection

The Schumacher SC1322 includes Auto Voltage Detection.

This feature automatically identifies whether the connected compatible battery is a 6V or 12V battery.

How Automatic Voltage Detection Works

When the charger is connected properly, it detects the battery voltage and selects the corresponding charging output.

The charger does not require manual selection between 6V and 12V.

Automatic Charging Output

The Battery Type button is still used to select STD or AGM battery chemistry.

Automatic Charging Mode

The SC1322 automatically manages charging after the battery has been connected and the correct battery type has been selected.

Automatic Charging Process

1. Connect a compatible battery.
2. Connect the charger to AC power.
3. Select STD or AGM.
4. The charger automatically detects the battery voltage.
5. Charging begins.
6. The yellow/orange Charging LED illuminates.
7. The charger continues charging automatically.
8. When the battery is fully charged, the green Charged/Maintaining LED illuminates.
9. The charger switches to Maintain mode.

Auto-Start Feature

The SC1322 includes an automatic start system.

Charging current is not supplied to the battery clamps until the charger detects a properly connected battery.

The clamps will not spark if they touch each other because charging current is disabled before a proper battery connection is established.

However, the safety instructions prohibit allowing the clamps to touch each other.

Battery Charging Times

Charging time depends on battery size, state of charge, age, condition, and charging current.

The charging-time chart in the owner’s manual provides estimated times for several battery sizes at different charging rates.

Estimated Battery Charging Times

These charging times are based on batteries that are approximately 50% discharged.

Actual charging times vary depending on battery age and condition.

Important: The chart compares several charging rates and battery sizes. It does not mean the SC1322 provides selectable 6A, 10A, 12A, and 15A charging modes. Its published output ratings are 2A at 6V and 10A at 12V. The chart is also not a substitute for the model’s recommended battery capacity limits.

Battery Desulfation Mode

The SC1322 includes an automatic desulfation process.

A lead-acid battery that has remained discharged may become sulfated and difficult to charge normally.

How Desulfation Works

During charging, the charger may enter its desulfation process when necessary.

The process attempts to address battery sulfation that interferes with normal charging.

Desulfation Duration

Desulfation may take approximately 8–10 hours.

Desulfation Failure

If desulfation is unsuccessful:

1. Charging is aborted.
2. Charging output is shut off.
3. The red Clamps Reversed/Bad Battery LED illuminates.

The battery should be checked and replaced if necessary.

Aborted Charge Mode

The SC1322 automatically stops charging when a battery cannot be charged normally.

What Happens When Charging Is Aborted?

• The charger stops supplying current.
• The red Clamps Reversed/Bad Battery LED illuminates.
• The charging process does not continue.

What to Do After Charging Is Aborted

Do not continue attempting to charge a battery after the charger has aborted the charging process.

Have the battery checked and replace it if necessary.

Maintain Mode (Float Mode Monitoring)

The SC1322 automatically switches to Maintain mode after the connected battery reaches full charge.

Maintain Mode Operation

When Maintain mode begins:

• The green Charged/Maintaining LED remains illuminated.
• The normal charging cycle is complete.
• The charger supplies a small amount of current when necessary.
• The battery is maintained at full charge.

Automatic Maintain Mode Shutdown

If the charger must supply its maximum maintenance current continuously for 12 hours, it enters Aborted Charge mode.

Possible causes include:

• An electrical load draining the battery.
• A defective battery.

Troubleshooting Maintain Mode Shutdown

1. Check for electrical loads connected to the battery.
2. Remove unnecessary loads.
3. If no electrical load is present, have the battery checked.
4. Replace the battery if necessary.

Maintaining 6V and 12V Batteries

The SC1322 can maintain compatible 6V and 12V lead-acid batteries.

Maintain mode allows a healthy battery to remain charged for extended periods.

However, vehicle electrical problems, battery defects, incorrect connections, or other conditions may cause excessive current draw.

The battery and charging process should be checked periodically.

Maintenance and Cleaning Instructions

Regular cleaning and proper cable care help keep the SC1322 operating correctly.

Cleaning Battery Clamps

After each charging session:

1. Disconnect the charger from AC power.
2. Disconnect the battery clamps.
3. Wipe away any battery fluid that may have contacted the clamps.
4. Clean the clamps to help prevent corrosion.

Cleaning the Charger Housing

Occasionally clean the charger housing using a soft cloth.

This helps maintain the finish and prevent corrosion.

Power Cord and Charging Cable Care

Coil the AC power cord and DC charging cables neatly when storing the charger.

This helps prevent accidental damage to the charger and cables.

Storage Instructions

The SC1322 should be stored indoors in a cool, dry location.

Proper Storage Procedure

1. Disconnect the charger from AC power.
2. Remove the battery clamps.
3. Clean the clamps.
4. Wipe the charger housing if necessary.
5. Coil the power and charging cables neatly.
6. Store the charger in an upright position.
7. Keep the charger in a cool, dry indoor location.

Battery Clamp Storage Precautions

Do not store the battery clamps:

• Clipped together.
• Clipped to the carrying handle.
• Attached to metal objects.
• Clipped around charging cables.

Troubleshooting Guide

The Schumacher SC1322 troubleshooting instructions cover charger startup problems, LED indicator behavior, automatic voltage detection, and battery charging failures.

Schumacher SC1322 Troubleshooting Table

Charger Does Not Turn On

If the charger does not operate when properly connected, check the electrical supply and battery.

Possible Causes

• Electrical outlet is not supplying power.
• Fuse or circuit breaker supplying the outlet has opened or tripped.
• Power cord connection is loose.
• Extension cord connection is poor.
• Battery is defective.

Troubleshooting Steps

1. Check the electrical outlet.
2. Inspect the fuse or circuit breaker supplying the outlet.
3. Check the power cord connection.
4. Inspect the extension cord if one is being used.
5. Have the battery checked if necessary.

Battery Clamps Do Not Spark

The SC1322 includes an auto-start feature that prevents charging current from reaching the clamps until a battery is connected correctly.

The absence of sparks when the clamps touch is normal.

The clamps must still be kept from contacting each other during use.

All Three LEDs Illuminate and Turn Off

When the charger is connected to an AC outlet, all three LEDs may illuminate for approximately two seconds before turning off.

This is normal operation.

Cannot Select 6V or 12V

The SC1322 uses automatic battery voltage detection.

It does not require manual selection between 6V and 12V.

The Battery Type button selects STD or AGM, not battery voltage.

Solid Red LED – Battery Fault Conditions

A solid red Clamps Reversed/Bad Battery LED may indicate several battery problems.

Low Battery Voltage After Two Hours

The red LED may illuminate if battery voltage remains below the following levels after two hours of charging:

The battery may be defective.

Check for connected electrical loads.

Remove any loads, and have the battery checked or replaced if necessary.

Excessive Maintenance Current

The charger may enter fault mode if the output current remains above 1.5A for 12 hours during Maintain mode.

This may indicate that an electrical load is draining the battery or that the battery is defective.

Remove any connected loads.

If no load is present, have the battery checked or replaced.

Failed Desulfation

A solid red LED may indicate that the desulfation process was unsuccessful.

The battery may be defective.

Have the battery checked or replaced.

Insufficient Charging Progress

The red LED may illuminate when charging progress is insufficient and battery voltage remains below:

Possible causes include:

• Battery overheating.
• A battery that is too large for the charger.
• An internal battery short circuit.

Allow the battery to cool if it has overheated.

Have the battery checked or replaced.

Low Initial Battery Voltage and Charge Acceptance

The charger may detect a fault when the battery’s starting voltage is below the following levels and total charging input is less than 1.5Ah:

The battery may have insufficient capacity or may be too old.

Have it checked or replaced.

Battery Voltage Drops During Maintain Mode

The red LED may illuminate if battery voltage drops below:

The battery may be unable to retain its charge.

Possible causes include:

• An electrical load draining the battery.
• A defective battery.

Remove unnecessary electrical loads.

If the problem continues, have the battery checked or replaced.

Two-Year Limited Warranty

The Schumacher SC1322 is covered by a two-year limited warranty.

Warranty Coverage

Warranty Repair or Replacement

If the charger develops a covered defect during the warranty period, Schumacher may repair the product or replace it with a new or reconditioned unit.

The manufacturer determines whether repair or replacement is appropriate.

The purchaser must provide proof of purchase and pay shipping charges in advance when sending the unit for warranty service.

Warranty Exclusions

The limited warranty may be void if the charger:

• Is misused.
• Is handled carelessly.
• Is repaired by an unauthorized person.
• Is modified without manufacturer authorization.
• Is resold through an unauthorized retailer.
• Has a warranty label removed when the manufacturer determines that removal voids coverage.

Accessories not manufactured and approved by Schumacher Electric Corporation are not covered by the limited warranty.

The warranty also contains limitations concerning other warranties and incidental or consequential damages. Applicable legal rights may vary by state.

Warranty Registration

Product warranty registration is available at:

www.batterychargers.com

The warranty registration card should be submitted within 30 days of purchase.

Keep the original retail purchase receipt because it is required for warranty claims.

Customer Support and Repair Information

Schumacher Electric Corporation provides customer assistance for troubleshooting, repairs, and product returns.

Customer Support Details

Repair and Return Procedure

1. Review the troubleshooting instructions.
2. Contact Schumacher Customer Service if the problem continues.
3. Describe the charging or operating problem.
4. Follow the assistance provided by customer support.
5. Request a Return Merchandise Authorization (RMA) number if repair or return is necessary.
6. Do not ship the charger until Schumacher has issued an RMA number.

Important: Do not send the charger to the warranty registration address for repairs.

Frequently Asked Questions

1. What batteries can the Schumacher SC1322 charge?

The Schumacher SC1322 is designed to charge compatible 6V and 12V standard (STD) and AGM lead-acid batteries. The English-language instructions recommend 12Ah for 6V batteries and 44–68Ah for 12V batteries. The charger must not be used to charge household dry-cell batteries or frozen batteries.

2. How many amps does the Schumacher SC1322 provide?

The SC1322 provides 2A DC at 6V and 10A DC at 12V. It uses automatic voltage detection and charges according to the connected battery’s voltage.

3. How do I select the battery type on the Schumacher SC1322?

The SC1322 has a Battery Type button for selecting STD or AGM. Select STD for compatible standard lead-acid batteries and AGM for compatible Absorbed Glass Mat batteries. The charger automatically detects whether the connected battery is 6V or 12V.

4. How do I know when the Schumacher SC1322 battery is fully charged?

The green Charged/Maintaining LED remains solid when the battery is fully charged. This indicates that the charger has completed its automatic charging cycle and entered Maintain mode.

5. What does a flashing red light mean on the Schumacher SC1322?

A flashing red Clamps Reversed/Bad Battery LED indicates that the battery clamps are connected with reversed polarity. Disconnect the charger from AC power before correcting the battery connections.

6. What does a solid red light mean on the Schumacher SC1322?

A solid red Clamps Reversed/Bad Battery LED means the charger has detected a battery problem. Possible causes include low battery voltage, failed desulfation, insufficient charging progress, overheating, or a battery that cannot maintain its charge. Have the battery checked or replaced according to the troubleshooting instructions.

7. How long does the Schumacher SC1322 take to charge a battery?

Charging time depends on the battery’s size, age, condition, and state of charge. The manufacturer’s charging-time chart estimates approximately 3 hours for a 300 CCA automotive battery and 7 hours for a 1000 CCA automotive battery at a 10A charging rate, assuming the battery is 50% discharged. Actual charging times may vary.

8. Can the Schumacher SC1322 maintain a battery after charging?

Yes. The SC1322 automatically switches to Maintain mode when charging is complete. The green LED remains illuminated, and the charger supplies a small amount of current when necessary to keep a compatible battery fully charged. The battery and charging process should still be checked periodically.