Jupiter Electric Bikes Support

Notes

Defiant Assembly Video

Watch this step by step video on Defiant Unboxing and Setup.

How To Access Settings / Adjust Speed Limit

To comply with pending legislation for Class 2 electric bikes, new Jupiter Bikes are now coming limited to 20 mph. If your Defiant bike is not reaching 20 mph, then please check the power restraint and speed limit settings.
defiant lcd setting
To check the Power Restraint, hold down Power and Up Arrow for 5 seconds. Press Up or Down arrow to adjust the large flashing value to 60. Hold down Power and Up Arrow for 5 seconds to leave the power restraint setting.

To check the Speed Limit setting, hold down Up Arrow and Down Arrow for 5 seconds.
The large flashing number needs to be set to 20. Hold down Up Arrow and Down Arrow for 5 seconds to leave the speed limit setting.

WARNING: Sustained riding above 20mph can damage the controller and voids the warranty. Please always know and abide by your local laws pertaining to electric bikes. Be responsible and safe when operating your Jupiter Bike.

How To Reset the Trip Meter

Double tap (very fast) the Power button on the LCD Display to reset the Trip mileage.
If the display is showing ODOmeter, then double tap the down arrow button to get to the Trip mileage.
Double tap the up arrow on the LCD Display to return to Odometer.

How To Switch Between MPH and KPH

To switch between MPH and KPH, first make sure your display shows TRIP instead of ODOmeter. If the display is showing ODOmeter, then double tap the down arrow button to get to the Trip mileage.
Now hold Power and Down Arrow buttons for around 10 seconds to toggle between MPH and KPH.

L04NH - 2026 Defiant Display Manual

Download the L04NH Display User Manual

L300 Display User Manual

Some Jupiter Bike Defiant models use the L300 Display.

Download the L300 Display User Manual

Defiant Powers On, but the Motor Doesn't Run

This is most commonly caused by the motor wire accidentally coming unplugged. Locate the plug on the motor wire near the rear fork and reconnect it.

Bike Battery Won't Charge

Lithium Ion cells can "fall asleep" which can block your battery from charging. You can wake the cells up by following these steps:

Place the battery in your freezer for 24 hours. It's okay if you're a bit over.
Let the battery thaw 6-8 hours. Please try to stay in this range, the timing on this step is important.
Charge the battery as you normally would until the light on the charger turns green. Please note that this can take up to 24 hours. Please unplug if the charger is still red after 24 hours.
You're good to go!

Another reason for your battery to not charge is a faulty charger, but this is much more rare.
Contact Jupiter Bike Tech Support at 813-609-2453 opt. 4 if you have questions or problems with this procedure.