RJ3000.
Ready when
you need it.
Charging, jump-start preparation and help for your Rexing portable jump starter.
Download user manual ↗
Start with a charged unit.
Charge before first use
Connect the supplied USB-C cable to a suitable power source. Press ON/OFF to view battery status. Disconnect when charging finishes.
Check the battery level
The guide requires more than 50% charge before jump-starting. A wall adapter is not included.
Match your version
The linked REV07292025 guide covers RJ2000, RJ3000 and RJ4000. Check the model and ratings printed on your unit, especially for an earlier revision.
Check before connecting.
Use with 12V vehicles
Read the supplied safety guide and vehicle instructions. Insert the clamp plug into the EC5 port. Connect red to battery positive (+) and black to negative (−).
Follow the readiness indicator
Follow your revision’s manual for BOOST and starting. Stop if an alarm or warning appears; resolve the cause before another attempt. Do not let the clamps touch.
Understand the next step.
Why does the unit alarm?
Possible causes include reversed clamps, temperature, overcurrent, too many attempts, a short circuit, high vehicle-battery voltage or low unit charge. Use the manual’s error table.
How should I store it?
Keep it away from extreme heat, water and fire. Do not leave it in a hot vehicle. Never use a damaged or swollen unit.
Help us identify your revision
Send the model label, display or warning code, purchase date and a description of what happened. This helps support find the correct instructions for your device.
Your manual. Your next step.
User manual
RJ2000 / RJ3000 / RJ4000
REV07292025 · PDF ↗
Warranty information
Review warranty and return information →
Find another model
Search all product support →
Still need a hand?
Contact Rexing with your RJ3000 model and revision.