NIU KQi3 Max – Setup, Charging, Operation, Maintenance & Fault GuideUpdated a month ago

MANUAL

WHAT’S IN THE BOX

NIU KQi3 Max scooter
Düsenverlängerung / Extension nozzle
Netzteil / Power adapter
Schraube M5 × 5 (one spare)
3 mm Allen key / socket head wrench

PRODUCT OVERVIEW

The manual labels these parts:

Accelerator
Headlight
Front reflector
Instrument
Bell
Brake lever
Side reflector
Wheel hub motor
Charging port
Folding wrench
Folding buckle
Disc brake calipers
Battery compartment
Kickstand

DASHBOARD INFO

The dashboard shows:

Bluetooth status
Abnormal temperature warning
Light status
Fault warning
Real-time vehicle speed / fault code display
Battery indicator
Pedestrian mode status
Riding mode
Operation keys

Dashboard controls

Long press the power button to turn the device on or off
Short press once for gear switch
Short press twice for light switch
Short press three times for speed unit switch
Short press five times to enter pedestrian mode

Pedestrian mode

Entered by short pressing the button 5 times
Speed is limited to 6 km/h
Short press again to exit this mode

Riding mode display

E-SAVE lights up: Eco mode
E-SAVE goes out: Sport mode
E-SAVE flashes: Custom mode (in app)

SETTING UP THE SCOOTER

Body assembly

Lock the folding mechanism and open the kickstand.
Connect the handlebar to the main line connector of the vertical tube and install the handlebar to the vertical tube.
Charge the scooter and it will turn on automatically.
Install the four screws.

Handlebar screw tightening torque:

4–5 N·m

Folding

Confirm that the kick scooter is powered off.
Hold the vertical tube.
Open the folding wrench.
Align it to the position of the mudguard hook.
Hook the hook under the dashboard to the rear end of the body.
Press the buckle button on the mudguard when opening.
After the hook under the dashboard is separated from the folding buckle, straighten the vertical tube to lock the folded plate.
Turn the folding wrench back.

Handling

Fold the scooter and hold the standpipe with one hand or both hands before transport.

CHARGING

Charger connection

Open the charging port first
Plug the charging plug into the body charging port
Then connect the power supply
After charging is complete, fasten the charging port cover to prevent water intake

Charging cautions

Do not charge when the charging port, charger, or power socket is wet
Turn off the power before charging
Only use the original charger provided by NIU
Do not use any other charger type
Do not charge or continue using the battery if it is damaged or flooded
Fasten the rubber plug of the charging port before or after charging
Do not charge outdoors
Do not ride while charging

PARKING

Turn on the parking device after use and park the vehicle
Turn on the parking device before use

FAST LOCKING

How to lock

Connect the electric scooter to the NIU app via Bluetooth and activate the fast locking function in the app.
Long press the On/Off button for 5 seconds to lock the scooter.
The lock icon is displayed on the meter.
The manual also shows an alarm when locking and flash two times per second while locking.

How to unlock

Long press the On/Off button for 2 seconds to start the scooter.
Click the Unlock button in the app interface to unlock the scooter connected to the app.

DOWNLOADING THE APP / ACTIVATION

Scan the QR code and install the NIU E-Scooter App
Bind and activate the scooter according to the prompts
After installing the app, log in and register
Long press the button to power the scooter on and the Bluetooth icon starts flashing
In the app, tap Me > Device Binding > Bind with Bluetooth
The scooter beeps when Bluetooth connects successfully
The Bluetooth icon stops flashing and stays on after successful connection
Activate the scooter according to the prompts in the app and learn how to drive safely

App requirements

Bluetooth 4.2 or above
iOS 10.0 or above
Android 5.0 or above
Bluetooth operating frequency: 2400–2483.5 MHz
Max radio power: 2 dBm

Owner / pairing notes

The account paired with Bluetooth for the first time is the vehicle owner
If the vehicle owner changes the mobile connection, the Bluetooth pairing must be reset
If the account connection changes, the original vehicle owner’s account must be unbound

BEFORE RIDING

Before riding:

Ensure the steering system and folding system are working properly and components are tightly secured
Check whether the wheel axle is fastened to the body to ensure the wheel rotates normally and the brake system works normally
Check tyre pressure before riding
Inflate the tyres every three months and keep tyre pressure between 45–50 psi
Check the wear of the tyres and brake pads
If wear is serious and replacement is needed, contact the dealer in time

First-use riding note

The new scooter will be locked in E-SAVE mode when first used
After you finish a 200 m ride, the scooter beeps
At that point, you can switch modes and ride at maximum speed

RIDING THE SCOOTER

Turn on the power and check the power indicator.
Stand on the pedal with one foot and push back with the other foot.
When the scooter is sliding, place the other foot on the pedal, keep both feet stable, and gently press the throttle.
The throttle starts working above 4 km/h.
Release the throttle and use energy recovery to decelerate.
Emergency braking requires a powerful grip on both brake levers.
Lean the body slightly in the direction of turning and slowly turn the handlebar.

Additional riding notes

There is a risk of fall injuries during practice
Wear a helmet and protectors while learning and riding
Deceleration through energy recovery can be adjusted within the app

WARNINGS

The manual includes these riding warnings:

Do not drive on public roads, motorways, or highways
Do not drive if water level exceeds 2 cm
Avoid riding in the rain
Braking distance is extended in wet weather
It is forbidden for multiple people to ride one scooter or to ride with children in arms
Do not ride with one foot on the pedal or on the ground
Always wear shoes
Do not step on the back of the mudguard
Always keep your hands on the handlebar when driving
Slow down when encountering deceleration zones, potholes, or unusual road surfaces
Do not accelerate downhill
Avoid obstacles
Turn on the headlight when driving in the dark
Do not ride up or down stairs or jump obstacles
Do not hang heavy objects such as backpacks on the handlebar
Do not drive indoors
Do not twist the throttle when walking with the kick scooter
Do not turn the handlebar substantially at high speed
Do not touch the disc brake shortly after use to avoid burns

Additional warning notes

Mechanical parts are subject to stress and wear
Cracks, scratches, and discoloration in high-stress areas may indicate a part has exceeded service life and should be replaced
In city traffic, avoid jumping obstacles such as curbs and steps
Adapt trajectory and speed before crossing obstacles
It is recommended to get off the scooter when obstacles become dangerous due to shape, height, or slippage
Keep plastic covering away from children to avoid suffocation
Ask your seller to refer you to an appropriate training organization
Avoid high traffic or overcrowded areas
Notify pedestrians or cyclists of your presence
Walk while crossing protected passages
Do not divert the use of the vehicle
This vehicle is not intended for acrobatic use
Eliminate any sharp edges caused by use
Do not modify or transform the vehicle, including the steering tube, sleeve, stem, folding mechanism, and rear brake
Self-tightening nuts and other self-tightening fastenings may lose efficiency and may need retightening
Do not make modifications not described in the instructions

TROUBLESHOOTING / FAULT GUIDE

The manual includes a full Troubleshooting of the whole vehicle table.

31 displayed – Battery MOS tube damaged
Action: Please contact the dealer
32 displayed – Battery moistened by water
Action: Please contact the dealer
37 displayed – Battery short-circuit protection warning
Action: Please contact the dealer
33 displayed – Battery open-circuit or imbalance warning
Action: Please contact the dealer
34 displayed – Battery low-temperature warning
Action: Place the vehicle at room temperature and reuse it after temperature is recovered
35 displayed – Battery over-temperature warning
Action: Make the vehicle still and use it after the internal temperature becomes normal
38 displayed – Battery charging overcurrent protection warning
Action: Please disconnect the charger
39 displayed – Battery discharging overcurrent protection warning
Action: Please contact the dealer
40 displayed – Battery over-charging warning
Action: You can ride normally, and it can recover after electricity reduces
41 displayed – Battery over-discharging warning
Action: Please charge the vehicle
42 displayed – Battery communication fault and verification failure
Action: Limit speed to 6 km/h, please contact the dealer

01 displayed – Power tube fault of the controller
Action: Please contact the dealer
02 displayed – Brake fault
Action: Please check the state of the brake handle or contact the dealer
03 displayed – Accelerator fault
Action: Please check the state of the accelerator switch or contact the dealer
04 displayed – Controller overcurrent
Action: Please contact the dealer
05 displayed – Controller over-temperature
Action: Make the vehicle still and use it after the internal temperature becomes normal
06 displayed – Fault of driving power of the controller
Action: Please contact the dealer
08 displayed – Undervoltage / overvoltage of the controller
Action: Please charge the vehicle or contact the dealer
07 displayed – Controller communication fault and verification failure
Action: Please contact the dealer
10 displayed – Motor locked-rotor
Action: Please contact the dealer
11 displayed – Motor phase loss
Action: Please contact the dealer
12 displayed – Motor HALL fault
Action: Please contact the dealer
13 displayed – Motor over-temperature
Action: Make the vehicle still and use it after the internal temperature becomes normal

MAINTENANCE AND CARE

Vehicle cleaning

Wipe the main frame with a soft wet cloth
If buildup is hard to remove, apply toothpaste and rub with a toothbrush, then wipe clean with a soft wet cloth
Do not clean the scooter with alcohol, gasoline, kerosene, or other corrosive and volatile solvents
Do not spray with pressure water guns or water pipes
Before cleaning, make sure the scooter is shut down, not charging, and the charging port is tightly buckled closed, otherwise water may damage electrical parts

Vehicle storage

Do not use accessories or additional items not approved by the manufacturer
Store the vehicle in a flat, stable, well-ventilated, and dry place
Prolonged exposure to UV rays, rain, and the elements may damage enclosure materials, so store indoors when not in use
For long-term storage, keep battery power between 30% and 70%
Recharge the battery every two months
After long-term storage, fully charge the battery before use and check tyre pressure
Do not charge when the charging port or charging cable is wet
If abnormal sounds occur during riding or pushing, stop riding and check the source before continuing
Do not use other models or brands of battery packs
Use the original charger only
Do not touch battery contacts and do not open or expose the shell
Do not store the vehicle near a heat source
If the battery is damaged or water enters the battery compartment, do not charge or continue using it
It is strictly forbidden to immerse the battery or vehicle body in water or ride in the rain
Do not take the battery out
Contact your dealer if needed

DISC BRAKE ADJUSTMENT

If braking force is too strong

Use a wrench to loosen the brake arm nut counterclockwise
Return the brake cable to shorten the exposed tail length
Lock the nut clockwise to confirm brake force and complete adjustment

If braking force is insufficient

Use a wrench to turn the fine adjustment screw counterclockwise
Confirm braking force through brake action
Tighten the limit nut clockwise after completion

CHANGING BRAKE PADS

Completely loosen the brake cable and remove the brake calipers from the vehicle body with a 4 mm hexagon wrench
Tilt the tail end of the brake pad return spring and remove it
Remove old brake discs one by one and clean the brake piston with a clean cloth
Put the new brake discs in one by one and push the two brake discs apart with tools
Push the return spring through the gap of the brake discs
Install the calipers to the vehicle body, thread the brake cable, and lock it in place

HANDLEBAR SHAKING DEBUGGING

Check whether the vertical tube screws are loose
If loose, fasten the standpipe screws first
Then fasten the two screws of the folding mechanism with a 6 mm hexagon wrench

USE OF THE EXTENSION NOZZLE

If the front and rear tyres are underinflated, use the extension nozzle to connect for inflation
Remove the tyre inflatable nozzle caps first
Tighten the extended inflatable nozzle and tyre inflatable nozzle
Connect the pump and inflate after they are tightened

NIU KQi3 MAX Unboxing and setup video

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