Kepler Dual battery: Removing and Installing Your ControllerUpdated 14 days ago

This guide walks you through removing and replacing the controller on your Ariel Rider e-bike. Follow the procedures in sequence to safely disassemble and install the controller assembly.

SAFETY WARNING: Before performing any maintenance or electrical work, remove both batteries from the bike and ensure the system is completely powered down.

Required Tools & Materials

• 2.5 mm hex wrench
• 3 mm hex wrench
• Electrical tape
• Wire cutters or snips (for zip ties)

Part 1: Removing the Controller

You can follow along with the video demonstration below or use the step-by-step written instructions.

1. Remove the Seat:Release and remove the seat assembly to gain clear access to the frame components.
   
2. Remove Both Batteries:
   • Remove the top tube battery.
   • Remove the down tube battery from the underside of the frame.
3. Access Bottom Bracket Cover:Locate the access plate below the bottom bracket. Using a 3 mm hex wrench, remove the four screws securing the cover housing the controller and battery balancer connectors.
   
4. Disconnect Battery Balancer:Gently pull out the battery balancer module and disconnect its wiring plugs.
   
5. Disconnect Remaining Connectors:Carefully disconnect all remaining wire harness connectors inside the bottom bracket cavity.
   
6. Free Motor Cable:
   • Clip the zip ties holding the controller and motor cable in place.
   • Unscrew the quick-disconnect motor connector ring and pull the connector apart.
   
   
7. Remove Seat Post Cover:Using a 3 mm hex wrench, remove the four screws from the cover located behind the seat post.
   
8. Slide Out Controller:Carefully slide the controller unit out of the frame tube, making sure cables do not snag. Remove the two screws securing the controller to its tray using a 3 mm hex wrench.
   

Part 2: Installing the Replacement Controller

1. Bundle Cable Assembly:Loosely bundle and wrap the cables from the new controller and DC-to-DC converter together using electrical tape on the assembly carrier.
   
2. Slide Controller into Frame:Lower the taped cable bundle into the controller compartment while sliding the carrier into the frame tube behind the seat post.
   
3. Guide Cables Out Bottom:Reach into the bottom bracket cavity, guide the cable bundle through the bottom opening, and remove the electrical tape.
   
4. Connect Wiring Harness:Reconnect all matching connector pairs, ensuring connections are fully seated.
   
5. Secure Bottom Bracket Cover: Carefully push excess cable slack back into the frame. Ensure no wires are pinched under the cover edge. Reinstall the cover with four M5 bolts, washers, and lock washers using a 2.5 mm hex wrench. Tighten to 3 Nm.
   
6. Secure Carrier Cover: Reinstall the carrier assembly cover behind the seat post using four M5 bolts, washers, and lock washers with a 2.5 mm hex wrench, ensuring the rubber seal is seated properly. Tighten to 3 Nm.
   
7. Final Assembly: Reinstall the seat post, clamp securely, and reinsert both batteries.

Post-Installation Check: Power on the system and perform a brief function check (lights, display, throttle, pedal assist) before taking a full test ride.

Need Additional Help?

If you encounter any difficulties during controller installation or need replacement parts, please reach out to our technical support team through our contact form.