Speed Unlock Controller for Xiaomi 4 Lite (2nd Gen) | Plug & Play

• High Performance Upgrade: Designed for 52V (13S) battery systems, offering superior power and efficiency.

• Dual Speed Modes: Easily switch between Street Mode (25km/h limit) and Off-Road Mode (up to 55km/h) via App or button combination.

• Smart App Control: Customize speed limits, enable cruise control, and monitor vehicle status directly from your smartphone.

• Intelligent Self-Learning: Automatic motor phase matching ensures smooth operation and easy installation (80s setup).

• Clear LCD Dashboard: Real-time display of speed, gear, and precise battery voltage monitoring.

User Manual & Operation Guide

1. Intelligent Self-Learning (First Time Setup)

• Step 1: With the scooter powered OFF, press and hold the Power Button for 10 seconds.

• Step 2: In the first second, you will hear a "Beep" and the screen will light up. Keep holding.

• Step 3: When you hear 3 short beeps ("Beep, Beep, Beep"), the self-learning process starts.

• Step 4: Wait for approximately 80 seconds. The system will beep 3 times again to indicate self-learning is complete.

2. Speed Modes & Gear Switching

• Switch Gears: Quickly double-click the Power Button to cycle through Gear 1, 2, and 3. (A beep confirms the switch).

• Speed Limits (Configurable via App):
  • Limited Mode (Street Legal):

    • Gear 1: 6 km/h

    • Gear 2: 15 km/h

    • Gear 3: 20-28 km/h (Adjustable in App: 20/22/25/28 km/h)

  • Unlimited Mode (Off-Road/Sport):

    • Gear 1: 6 km/h

    • Gear 2: 15 km/h

    • Gear 3: 40-55 km/h (Max speed depends on motor/load)

3. How to Unlock/Lock Speed Limit (Manual Method)

• Unlock Speed (Limit -> Unlimited): Hold the Brake Lever + Press Power Button (Long press, short press, or multiple clicks all work) -> Then release the Brake.

• Lock Speed (Unlimited -> Limit): Repeat the same action: Hold Brake + Press Power Button -> Release Brake.

4. Cruise Control

• Enable: Turn on "Cruise Control" in the Mobile App. Maintain a steady speed for 10 seconds to activate.

• Disable:

  • Method 1: Twist the throttle and release.

  • Method 2: Press the brake lever.

5. Battery Voltage & Indicator (For 13S 52V Battery) Precise battery monitoring with 5-bar LED display:

• 52.4V - 54.6V: 5 Bars (80% - 100%)

• 50.3V - 52.4V: 4 Bars (60% - 80%)

• 48.0V - 50.3V: 3 Bars (40% - 60%)

• 45.8V - 48.0V: 2 Bars (20% - 40%)

• 43.5V - 45.8V: 1 Bar (0% - 20%)

• 39.9V - 43.5V: Red Light Flashing (Low Voltage Warning)