Jump Starter SL1474

Schumacher Lithium Ion Jump Starter SL1474

The Schumacher SL1474 Lithium Ion Jump Starter and USB Power Source is a portable, rechargeable jump starter designed to assist with starting vehicles equipped with 12V DC lead-acid battery systems. It also includes a USB power output, a built-in work light, and an air compressor for inflating tires and other compatible inflatable items.

The SL1474 contains an internal lithium-ion battery that charges through a Micro-USB input port. Using a suitable 2A USB charger or charging port, the battery can reach full charge in approximately 3–4 hours.

The jump starter has battery status indicators, a Ready/Fail LED, an audible fault buzzer, and automatic protection against short circuits, reversed polarity, reverse charging, low battery voltage, and high temperatures.

Its built-in air compressor is rated for a maximum of 150 PSI and includes a pressure gauge, flexible inflation hose, and adapters. The unit also features Energy Saving mode, which automatically reduces power consumption after 10 minutes of inactivity.

Product Features

The Schumacher SL1474 includes the following features:

• Rechargeable lithium-ion internal battery.
• Jump-starting support for compatible 12V DC lead-acid battery systems.
• Micro-USB charging input.
• USB power output rated at 5V DC and up to 2.4A.
• Approximately 3–4 hours of battery charging time with a suitable 2A USB charging source.
• Red, yellow, and green battery charge indicators.
• Ready/Fail LED for jump-starting status and fault indications.
• Audible buzzer for selected protection conditions.
• ON/OFF power switch.
• Battery Status/Light button.
• Built-in work light.
• Air compressor with a maximum pressure rating of 150 PSI.
• Air compressor pressure gauge.
• Air compressor ON/OFF switch.
• Inflation hose and adapters.
• Automatic compressor thermal protection.
• Energy Saving mode after 10 minutes of inactivity.
• Reverse-polarity protection.
• Short-circuit protection.
• Battery low-voltage protection.
• Reverse-charging protection.
• High-temperature protection.
• Low-temperature protection.
• Battery clamps with storage holders.

Technical Specifications

Parts and Components

The Schumacher SL1474 includes 14 main components identified in the product diagram.

Main Parts and Their Functions

Control Panel and Button Functions

The Schumacher SL1474 uses separate controls for jump-starting, battery monitoring, USB output, work lighting, and air compression.

ON/OFF Power Switch

The ON/OFF power switch controls the jump starter’s main power functions.

The switch must remain OFF while the battery clamps are being connected to a vehicle.

After the clamps have been connected correctly, the switch can be turned ON to activate the jump-starting function.

The power switch must also be ON when using the USB output or built-in work light.

Battery Status/Light Button

The Battery Status/Light button performs two functions:

• Checks the internal battery charge level.
• Turns the built-in work light on or off.

Press the button normally to check the battery charge when the unit is powered on.

Press and hold the button for approximately 0.75 second to turn the work light on or off.

Ready/Fail LED

The Ready/Fail LED indicates whether the jump starter is ready for use or a protective condition has been activated.

A solid green LED indicates that the jump starter is ready.

Red or alternating red and green LED patterns indicate different electrical faults.

Air Compressor ON/OFF Switch

The air compressor has its own ON/OFF switch.

This switch starts and stops the inflation process.

Air Compressor Gauge

The compressor gauge displays inflation pressure.

It must be monitored during inflation to prevent overinflation.

USB Charging Input and Output

The unit has separate connections for charging its internal battery and powering external USB devices.

Battery Status LED Indicator Guide

The Schumacher SL1474 uses red, yellow, and green LEDs to show the internal lithium-ion battery charge level.

Battery Charge Indicator Meanings

Flashing Red Battery Status LED

A flashing red battery status LED indicates that the internal battery has approximately 0–5% charge remaining.

Recharge the jump starter immediately.

Solid Red Battery Status LED

A solid red LED indicates that the internal battery is approximately 6–49% charged.

Solid Yellow Battery Status LED

A solid yellow LED indicates that the internal battery is approximately 50–75% charged.

Solid Green Battery Status LED

A solid green battery status LED indicates that the internal battery is approximately 76–100% charged.

Important Safety Instructions

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

Lead-acid vehicle batteries generate explosive gases during normal operation. The Schumacher SL1474 must be operated according to the safety instructions provided by Schumacher and the vehicle battery manufacturer.

General Safety Precautions

• Read the operating instructions before using the jump starter.
• Keep the jump starter away from children.
• Do not disassemble the unit.
• Have repairs performed by a qualified service professional.
• Do not use the jump starter while its internal battery is charging.
• Do not recharge the unit using a damaged USB cable.
• Provide adequate ventilation because the jump starter becomes warm during charging.
• Do not place the jump starter on flammable materials such as carpeting, upholstery, paper, or cardboard.
• Position the jump starter as far from the vehicle battery as the cables permit.
• Do not expose the jump starter to rain or snow.
• Never attempt to jump-start a frozen battery.
• Never place the jump starter directly above the battery being jump-started.
• Never allow the battery clamps to touch each other or the same metal surface.
• Use only attachments recommended or sold by the manufacturer.
• Never operate a damaged jump starter.

Vehicle Battery Restrictions

The SL1474 must only be used with vehicles, boats, and garden tractors equipped with a 12V DC battery system.

The jump-starting function is intended for lead-acid vehicle batteries.

It must not be used to jump-start household dry-cell batteries.

IMPORTANT: The jump starter is not designed to replace a vehicle battery.

A battery must be installed in the vehicle when the jump-starting function is used.

Operating the jump starter without an installed vehicle battery may damage the vehicle’s electrical system.

Personal Safety Precautions

When working near a lead-acid battery:

1. Wear complete eye protection.
2. Wear protective clothing.
3. Have another person nearby who can provide assistance.
4. Keep fresh water, soap, and baking soda available.
5. Remove rings, bracelets, necklaces, watches, and other metal jewelry.
6. Keep sparks and open flames away from the battery.
7. Never smoke near the vehicle battery or engine.

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

Battery Acid Safety

Battery acid can cause burns and serious eye injuries.

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

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

Battery acid spills should be thoroughly neutralized with baking soda before cleanup.

Lithium-Ion Battery Fire Safety

The Schumacher SL1474 contains a lithium-ion battery.

In the event of a battery fire, the manufacturer’s instructions identify the following extinguishing agents:

• Water.
• Foam extinguisher.
• Halon.
• Carbon dioxide (CO2).
• ABC dry chemical.
• Powdered graphite.
• Copper powder.
• Sodium carbonate.

After the fire has been extinguished, the product must be cooled using water, a water-based extinguishing agent, or another nonalcoholic liquid to reduce the risk of reignition.

WARNING: Never attempt to pick up or move a product that is hot, smoking, or burning.

Air Compressor Safety

When using the air compressor:

• Read the inflation instructions for the item being inflated.
• Do not exceed the item’s recommended inflation pressure.
• Do not overinflate tires or other inflatable items.
• Never leave the compressor unattended during operation.
• Use the compressor pressure gauge to monitor inflation.

Before First Use

The internal lithium-ion battery must be charged before the jump starter is used.

Initial Preparation Instructions

1. Place the jump starter on a stable surface.
2. Inspect the housing, battery clamps, compressor hose, and charging cable for damage.
3. Make sure the main ON/OFF power switch is OFF.
4. Make sure the compressor switch is OFF.
5. Secure the battery clamps on their storage holders.
6. Connect the Micro-USB charging cable to the unit.
7. Connect the USB end to a suitable USB charging source.
8. Allow the internal battery to charge completely.
9. Disconnect the charging cable.
10. Check the internal battery charge level before using the unit.

IMPORTANT: Charge the jump starter immediately after purchase, after every use, and every 30 days to keep the internal battery charged and prolong its service life.

How to Check the Internal Battery Charge Level

The Battery Status/Light button activates the LEDs used to check the internal lithium-ion battery.

Battery Status Checking Instructions

1. Turn on the jump starter using the ON/OFF power switch.
2. Press the Battery Status/Light button on the front of the unit.
3. Check the illuminated battery status LED.
4. Compare the LED indication with the battery charge level chart.

A flashing red LED indicates that the internal battery has 0–5% charge remaining and must be recharged immediately.

How to Charge the Internal Lithium-Ion Battery

The Schumacher SL1474 charges through its Micro-USB input port.

A 2A USB charger or 2A USB charging port is recommended for faster charging.

Charging Requirements

A USB charging source providing less than 2A increases charging time.

Internal Battery Charging Instructions

1. Connect the Micro-USB end of the charging cable to the jump starter’s input port.
2. Connect the USB end to a suitable USB charger or charging port.
3. Connect the charger to an active power source.
4. Allow the internal battery to charge.
5. Monitor the battery status LEDs.
6. Wait until the green LED becomes solid, indicating full charge.
7. Disconnect the USB charger from the power source.
8. Remove the charging cable from the charger and jump starter.
9. Turn the power switch OFF if the jump starter will not be used immediately.

How Long Does the SL1474 Take to Charge?

The internal lithium-ion battery takes approximately 3–4 hours to reach full charge using a suitable 2A USB charger or charging port.

Using a charger that provides less than 2A increases the charging time.

LED Indicators During Battery Charging

The SL1474 uses different LED patterns to communicate charging progress.

Charging Status LED Meanings

Flashing Red LED During Charging

A flashing red battery status LED indicates that the internal battery is between 0% and 49% charged.

Red LED Solid and Yellow LED Flashing

This combination indicates that the battery is approximately 50–75% charged.

Red and Yellow LEDs Solid, Green LED Flashing

This pattern indicates that the internal battery is approximately 76–99% charged.

Solid Green LED During Charging

A solid green battery status LED indicates that the internal battery is fully charged.

The green LED becomes solid approximately 10 seconds after the battery reaches full charge.

Charging Protection Warning

If the red Ready/Fail LED illuminates and the buzzer sounds, a protection function has been activated.

Possible protection conditions include:

• Short circuit.
• Low battery voltage.
• Reversed polarity.
• Other detected electrical faults.

The jump starter will not operate while the protection condition is active.

How to Jump Start a Vehicle

The Schumacher SL1474 can assist with starting compatible vehicles equipped with 12V DC lead-acid battery systems.

WARNING: Never use the jump starter while its internal lithium-ion battery is charging.

Before Jump-Starting

1. Confirm that the vehicle uses a 12V DC battery system.
2. Make sure a battery is installed in the vehicle.
3. Turn the vehicle ignition OFF.
4. Keep the jump starter power switch OFF.
5. Position the DC cables away from fan blades, belts, pulleys, and other moving engine components.
6. Identify whether the vehicle has a negative-ground or positive-ground electrical system.

Connecting to a Negative-Ground Vehicle

Most vehicles have a negative-ground electrical system.

1. Connect the red positive clamp to the positive (+) battery terminal.
2. Connect the black negative clamp to the vehicle chassis or engine block away from the battery.
3. Make sure both connections are secure.

Connecting to a Positive-Ground Vehicle

For a vehicle with a positive-ground electrical system:

1. Connect the black negative clamp to the negative (–) battery terminal.
2. Connect the red positive clamp to the vehicle chassis or engine block away from the battery.
3. Make sure both connections are secure.

Starting the Engine

1. After connecting the clamps correctly, press the ON/OFF power switch to turn on the jump starter.
2. Confirm that the green Ready LED is illuminated.
3. Wait approximately 30 seconds after connecting the clamps before attempting to start the vehicle.
4. Crank the engine for no more than 5 seconds.
5. If the engine does not start, wait 30 seconds before attempting another start.
6. After the engine starts, press the ON/OFF switch to turn the jump starter OFF.
7. Disconnect the black negative clamp first, followed by the red positive clamp.
8. Recharge the internal battery as soon as possible after use.

Jump-Starting Time Limits

If the engine does not start after the recommended attempts, disconnect the jump starter and investigate other vehicle problems.

Ready/Fail LED Indicator Guide

The Ready/Fail LED communicates whether the jump starter is ready for use or a protection condition has been activated.

Some faults are also accompanied by an audible buzzer.

Ready/Fail LED and Buzzer Meanings

Solid Green Ready/Fail LED

A solid green Ready/Fail LED indicates that the jump starter is ready for jump-starting.

Solid Red LED With Continuous Buzzer

A solid red Ready/Fail LED accompanied by a continuous buzzer indicates short-circuit protection.

The protection system prevents the jump starter from operating under this condition.

No LED and No Buzzer

No Ready/Fail LED illumination and no buzzer sound indicate the battery low-voltage protection condition identified in the owner’s manual.

The internal battery charge level should be checked.

Alternating Green and Red LED

Alternating green and red flashes indicate reverse-charging protection.

Flashing Red LED With Two Beeps Per Second

A flashing red Ready/Fail LED accompanied by two beeps per second indicates reverse-polarity protection.

The battery clamp connections must be checked and corrected.

Flashing Red LED With One Beep Per Second

A flashing red Ready/Fail LED accompanied by one beep per second indicates high-temperature protection.

All Battery Status LEDs Flashing Together

If the red, yellow, and green battery status LEDs flash simultaneously, the unit’s high-temperature protection has been activated.

How to Use the USB Power Port

The Schumacher SL1474 includes a USB output port for powering compatible electronic devices.

USB Output Specifications

USB Charging Instructions

1. Make sure the battery clamps are securely attached to their storage holders.
2. Turn the ON/OFF power switch to ON.
3. Connect the electronic device to the USB output port.
4. Turn on the connected USB device.
5. When finished, turn the power switch to OFF.
6. Recharge the internal battery as soon as possible after use.

How to Use the Built-in Work Light

The SL1474 includes a work light controlled by the Battery Status/Light button.

Work Light Operating Instructions

1. Place the jump starter on a flat, stable surface near the work area.
2. Make sure the battery clamps are securely attached to their storage holders.
3. Turn the ON/OFF power switch to ON.
4. Press the Battery Status/Light button for approximately 0.75 second to turn on the work light.
5. Press the same button for approximately 0.75 second to turn off the work light.
6. Recharge the internal battery as soon as possible after use.

How to Use the Air Compressor

The Schumacher SL1474 includes a built-in air compressor rated for a maximum pressure of 150 PSI.

The compressor has a pressure gauge, flexible hose, separate ON/OFF switch, and inflation adapters.

Air Compressor Safety Instructions

WARNING: Read the inflation instructions for the item being inflated before operating the compressor.

• Do not exceed the item’s recommended inflation pressure.
• Do not overinflate tires or other inflatable items.
• Do not leave the compressor unattended while operating.
• Monitor the pressure using the built-in gauge.
• Allow the unit to cool after inflation.

Air Compressor Operating Instructions

1. Remove the air compressor hose from the storage cleats.
2. Connect the hose adapter to the valve stem by threading it onto the end.
3. Use one of the additional inflation adapters if necessary.
4. Turn the air compressor ON/OFF switch to ON.
5. Allow the compressor to inflate the item.
6. Monitor the compressor gauge until the required pressure or fullness is reached.
7. Turn the air compressor switch to OFF.
8. Unscrew the connector from the valve stem.
9. Wrap the compressor hose around the storage cleats.
10. Allow the unit to cool.
11. Recharge the internal battery before storing the jump starter.

Air Compressor Specifications

Estimated Air Compressor Inflation Times

These values are approximate.

Use the compressor gauge to confirm that the correct inflation pressure has been reached.

Do not exceed the pressure recommended by the manufacturer of the item being inflated.

Air Compressor Overheat Protection

The SL1474 compressor includes built-in thermal protection.

If the compressor becomes too hot, the thermal protection system shuts it off automatically before overheating.

If the compressor shuts off during use:

1. Stop attempting to operate the compressor.
2. Allow the compressor to cool for a few minutes.
3. The compressor may restart automatically once it has cooled.

The compressor should not be left unattended during operation.

Energy Saving Mode

The Schumacher SL1474 includes an automatic Energy Saving mode to reduce battery discharge when the jump starter is left unused.

How Energy Saving Mode Works

If the jump starter is not used after being switched ON, it enters Energy Saving mode after approximately 10 minutes.

When Energy Saving mode activates:

• The USB port turns off.
• The Battery Status/Light function turns off.
• The green Ready/Fail LED turns off.

How to Reactivate the Jump Starter

1. Turn the unit ON using the power switch.
2. The green Ready/Fail LED illuminates.
3. If the unit has entered Energy Saving mode, press the Battery Status/Light button once.
4. The unit becomes ready for battery status checks, jump-starting, USB output, and work light operation.

Maintenance and Cleaning Instructions

The Schumacher SL1474 requires regular battery charging and basic cleaning to maintain its operating condition.

Cleaning the Battery Clamps

After each use:

1. Turn the jump starter OFF.
2. Disconnect the unit from the vehicle battery.
3. Clean the battery clamps.
4. Return the clamps to their support posts.

Cleaning the Housing

Clean the jump starter housing after use.

Air Compressor Hose Care

After inflation:

1. Turn the compressor OFF.
2. Disconnect the hose from the inflation valve.
3. Wrap the hose around the storage cleats.
4. Allow the unit to cool before storage.

Internal Battery Maintenance

The internal lithium-ion battery should be kept charged.

• Charge immediately after purchase.
• Charge after every use.
• Charge at least once every month during periods of infrequent use.
• Never allow the internal battery to become completely discharged.

Storage Instructions

The Schumacher SL1474 should be stored with its internal battery fully charged and its accessories properly secured.

Recommended Storage Conditions

Proper Storage Procedure

1. Turn the ON/OFF power switch to OFF.
2. Turn the compressor switch to OFF.
3. Disconnect the jump starter from the vehicle and charging source.
4. Clean the clamps and housing.
5. Charge the internal battery to full capacity.
6. Attach the battery clamps to their support posts.
7. Wrap the compressor hose around its storage cleats.
8. Store the jump starter within the specified temperature range.
9. Recharge the unit at least once every month if it is not frequently used.

Battery Storage Precautions

Never completely discharge the internal battery.

The battery clamps must remain on their support posts to prevent contact with metal surfaces.

Troubleshooting Guide

The Schumacher SL1474 troubleshooting instructions address engine starting failures, low-temperature protection, internal battery problems, compressor shutdowns, and LED fault indications.

Schumacher SL1474 Troubleshooting Table

SL1474 Will Not Jump Start a Vehicle

If the jump starter does not start the engine, several conditions should be checked.

Poor Battery Clamp Connections

Battery clamps that are not making proper contact can prevent the jump starter from operating.

Check the battery and chassis connections.

Make sure the connection points are clean.

Reversed Battery Clamps

If the battery clamps are connected incorrectly, disconnect the jump starter and correct their positions.

Low Internal Battery Charge

Turn on the jump starter and press the Battery Status/Light button.

Check the LED indicators to determine whether the internal battery requires charging.

Defective Vehicle Battery

If the jump starter is charged and the connections are correct, the vehicle battery may be defective.

Have the vehicle battery checked.

Jump Starter Is Turned OFF

The ON/OFF power switch must be turned ON to activate the jump-starting function.

SL1474 Will Not Turn On or Operate

The jump starter may stop operating when low-temperature protection is active.

Low-Temperature Protection

If the unit does not operate because of low-temperature protection, the manufacturer instructs using a USB adapter to charge and activate the jump starter.

SL1474 Internal Battery Will Not Hold a Charge

If the internal lithium-ion battery does not retain its charge, the battery may be defective or unable to accept charging current.

Have the internal battery checked.

SL1474 Air Compressor Keeps Shutting Off

The air compressor may stop operating because the built-in thermal protection has been activated.

Compressor Overheat Protection

The thermal protection system stops the compressor before it overheats.

If this happens:

1. Allow the compressor to cool for a few minutes.
2. Wait for the thermal protection to reset.
3. The compressor will automatically restart when it has cooled.

SL1474 Ready/Fail LED Faults

The Ready/Fail LED identifies different protective operating conditions.

Short-Circuit Protection

A solid red Ready/Fail LED and a continuous buzzer indicate that short-circuit protection has been activated.

Low-Voltage Protection

No Ready/Fail LED and no buzzer sound indicate battery low-voltage protection.

Reverse-Charging Protection

Alternating green and red Ready/Fail LED flashes indicate reverse-charging protection.

Reverse-Polarity Protection

A flashing red Ready/Fail LED accompanied by two beeps per second indicates reverse-polarity protection.

High-Temperature Protection

A flashing red Ready/Fail LED accompanied by one beep per second indicates high-temperature protection.

If the red, yellow, and green battery status LEDs flash simultaneously, high-temperature protection is active.

FCC Radio Frequency Interference Information

The Schumacher SL1474 is identified as complying with the limits for a Class B digital device under Part 15 of the FCC Rules.

These limits are intended to provide reasonable protection against harmful radio-frequency interference in residential installations.

If the unit causes interference with radio or television reception, the following corrective measures may be used:

• Reorient or relocate the receiving antenna.
• Increase the distance between the jump starter and receiver.
• Connect the equipment to an outlet on a different electrical circuit.
• Consult the dealer or an experienced radio or television technician.

Replacement Parts and Accessories

Schumacher identifies the following replacement charging cable for the SL1474.

Replacement Charging Cable

Replacement parts information is available at:

batterychargers.com

Limited Warranty

The Schumacher SL1474 Lithium Ion Jump Starter and USB Power Source is covered by a one-year limited warranty.

Warranty Information

The manufacturer’s warranty information can be obtained through its website or by contacting customer support.

Customer Support and Repair Information

Schumacher provides information for repairs, returns, warranty assistance, and replacement parts.

Customer Support Details

Repair and Return Procedure

1. Review the troubleshooting instructions.
2. Identify the operating problem.
3. Visit 365rma.com for repair or return requests.
4. Follow the service and return instructions provided by the manufacturer.

Replacement parts information is available at batterychargers.com.

Frequently Asked Questions

1. How do I charge the Schumacher SL1474 lithium-ion jump starter?

The Schumacher SL1474 charges through its Micro-USB input port using the supplied Micro-USB to USB charging cable and a suitable USB power source. A 2A USB charger or charging port is recommended. The internal battery takes approximately 3–4 hours to charge, and the green battery status LED becomes solid when charging is complete.

2. How long does the Schumacher SL1474 take to charge?

The internal lithium-ion battery takes approximately 3–4 hours to reach full charge when using a suitable 2A USB charger or charging port. A USB charging source providing less than 2A increases the charging time.

3. What do the battery status lights mean on the Schumacher SL1474?

The battery status LEDs indicate the internal battery charge level. A flashing red LED means 0–5%, solid red means 6–49%, solid yellow means 50–75%, and solid green means 76–100%. A flashing red battery status LED indicates that the unit requires immediate charging.

4. How do I jump start a car with the Schumacher SL1474?

With the power switch OFF, connect the battery clamps according to the vehicle’s grounding system. Turn the unit ON and confirm that the green Ready LED illuminates. Wait approximately 30 seconds before starting the engine. Crank for no more than 5 seconds and wait 30 seconds between attempts. After the engine starts, turn the jump starter OFF, remove the black clamp followed by the red clamp, and recharge the internal battery.

5. What is the maximum PSI of the Schumacher SL1474 air compressor?

The Schumacher SL1474 air compressor is rated for a maximum of 150 PSI. It includes a built-in pressure gauge and a manual ON/OFF switch. The compressor must be turned OFF when the required pressure is reached, and the inflation pressure must not exceed the manufacturer’s recommendation for the item being inflated.

6. Why does the Schumacher SL1474 air compressor stop working?

The compressor includes automatic thermal protection that shuts it off before overheating. When the compressor stops because of excessive temperature, allow it to cool for a few minutes. The compressor will automatically restart after cooling.

7. What does a flashing red Ready/Fail LED mean on the Schumacher SL1474?

A flashing red Ready/Fail LED indicates a protective condition. If the buzzer sounds twice per second, reverse-polarity protection is active. If the buzzer sounds once per second, high-temperature protection is active. The buzzer pattern identifies the type of fault.

8. Can the Schumacher SL1474 charge a phone or other USB device?

Yes. The Schumacher SL1474 includes a USB output rated at 5V DC and up to 2.4A. With the battery clamps secured on their holders, turn the unit ON and connect a compatible USB device. Turn the switch OFF and recharge the internal battery after use.