Schumacher Electric SJ1

Questions and Answers

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Jason JonesAug 7, 2025
What to do if my Schumacher Electric Power Supply won't jump start my car?
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  ricky49Aug 7, 2025
  If your Schumacher Electric Power Supply won’t jump start your car, several factors could be at play. First, ensure the clamps have a solid connection to both the battery and the frame, and that these connection points are clean. If the connections are reversed, disconnect and reverse the clamps. Check the battery status by pressing the Battery Status button on the unit's front to ensure it's adequately charged. Also, verify that the portable power is turned on by setting the ON/OFF switch to the ON position. If these steps don't resolve the issue, the vehicle's battery might be defective and should be checked.
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Joseph ZimmermanAug 11, 2025
Why is the alarm on my Schumacher Electric Power Supply on?
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  Erin ClayAug 11, 2025
  If the alarm on your Schumacher Electric Power Supply is activated, it likely indicates reversed connections. To resolve this, disconnect the jump starter and reverse the clamps.
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Edward KimAug 16, 2025
What to do if my Schumacher Electric Power Supply won’t power my 12V device?
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  thomasmichaelAug 16, 2025
  If your Schumacher Electric Power Supply won't power your 12V device, start by ensuring the 12V device is switched on. Next, check the portable power's battery charge by pressing the Battery Status button. If the device still won't power on, it's possible the 12V device draws more than 15A or has a short circuit. In this case, a qualified service technician should replace the fuse.
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Christopher AllenAug 21, 2025
Why does the display of my Schumacher Electric Power Supply show 'err'?
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  Joshua SullivanAug 21, 2025
  If the converter is on but the display of your Schumacher Electric Power Supply only shows 'err', it could be due to two reasons. Either the jump starter battery isn't fully charged (recharge the unit), or the device you're using is drawing too much power (more than 200W) or has a short circuit. Ensure you're only using devices that draw less than 1.7 amps of AC current.
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angelica09Aug 27, 2025
Why won’t the battery in my Schumacher Electric Power Supply hold a charge?
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  waynepaulAug 27, 2025
  If the battery in your Schumacher Electric Power Supply won’t hold a charge, it's likely that the battery is faulty and cannot accept a charge. It is recommended to have the battery checked.
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james41Aug 31, 2025
What to do if the compressor on my Schumacher Electric Power Supply shuts off?
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  Ashley AcostaAug 31, 2025
  If the compressor on your Schumacher Electric Power Supply shuts off, it's likely overheated. Allow it to cool down for a few minutes before trying again.

Summary

IMPORTANT SAFETY INSTRUCTIONS

PERSONAL SAFETY PRECAUTIONS

Restrictions on Use

Details limitations and warnings for using the jump starter with life support devices.

FEATURES

CHARGING THE INTERNAL BATTERY OF THE PORTABLE POWER

Checking the Internal Battery Level

Explains how to check the internal battery charge status using the display.

Charging the Internal Battery

Details the process of charging the internal battery using an extension cord.

Charging the Internal Battery While Driving

Provides instructions for charging the unit while driving using a 12V port.

USING THE PORTABLE POWER

Digital Display and Voltage Reading

Explains how to interpret the digital display for battery status and vehicle voltage.

Jump Starting a Vehicle

Step-by-step guide on how to jump start a vehicle using the portable power.

Using the Work;Emergency Flex Light

Instructions on how to operate the built-in flex light for illumination.

Using the USB Ports

Details on using the USB ports to charge devices and their optimization for different OS.

Powering a 12 V DC Device

Guide on using the portable power as a source for 12V DC accessories.

USING THE AIR COMPRESSOR

USING THE CONVERTER

Powering a 110 V AC Device

Instructions for powering 110V AC devices using the portable power's AC outlet.

MAINTENANCE AND CARE

TROUBLESHOOTING

BEFORE RETURNING FOR REPAIRS

SPECIFICATIONS

ACCESSORIES

REPLACEMENT PARTS

LIMITED WARRANTY

Schumacher Electric SJ1 Specifications

General

Model	SJ1
Type	Battery Charger
Input Voltage	120V AC
Output Voltage	12V DC
Amperage	1.5A
Charger Type	Automatic
Battery Compatibility	12V Lead-Acid Batteries
Safety Features	Short circuit protection, reverse polarity protection