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  • BOTTLE BATTERY
    EBIKE KIT FOR BROMPTON

    ASSIST RANGE UP TO 6OKM/SMART ASSSIT SYSTEM /BUILT IN GYROSCOPE /ROAD SLOPE DEGREES DETECTION /ALL TERRAIN APPLICATION /ANTI-THEFT TRACKING

  • SADDLE BAG BATTERY
    EBIKE KIT FOR BROMPTON

    ASSIST RANGE UP TO 9O-120KM/SMARTASSSIT SYSTEM /BUILT IN GYROSCOPE /ROAD SLOPE DEGREES DETECTION /ALL TERRAIN APPLICATION /ANTI-THEFT TRACKING

  • 3 Steps

    Fast installation

  • 25km/h

    Safe speed

  • Bluetooth 5.0

    A new era of interactive experience

  • 3 drive ways

    Pedal assist / Cadence /Throttle

  • 5 modes

    Intelligent assist modes

  • 250W

    High Effectiency Brushless motor

Product Specifications

    Model
    KN20S / KD30S / KD40S
    Battery Capacity
    36V 6Ah / 36V 9Ah / 36V 12AH
    Charging time
    3H
    Charger
    AC110V - AC220V,DC42V 2A
    Assist Range
    60km

    *The assist range is under conditions: 60kg weight rider, ouside temperature 25℃,no wind, 50% assist level under manual mode, tires with enough air pressure, riding on flat level road.

    Top Speed
    25km/h
    Wheel size
    16"
    Rated Power
    250W
    Max Torque
    30N.m
    Product Dimensions
    KN Series
    Product Dimensions
    KD Series
    Motor Weight
    1.7kg
    Battery Weight
    1.35kg/1.74kg/2.22kg (KN20S/KD30S/KD40S)
    Controller Weight
    0.34kg/0.34kg/0.34kg (KN20S/KD30S/KD40S)
    Package
    50*21*59cm

INSTALLATION VIDEO

Just 3 steps to convert a normal bike into a smart ebike

Installation requirements

  • Step 1:Pls.confirm the front fork open width is 74mm.
  • Step 2:Pls.confirm socket groove open width is 8mm.

Installation Completed

High quality 18650 lithium battery

EV lithium-ion battery cell with internal resistance as low as 18mΩ, capacity of 2900mA, 3C high-rate discharge.The 18650 power lithium battery offers consistency, high energy density, and faster charge-discharge performance. Tried and tested over time, 80% capacity remains after 1000 cycles.

Using Taiwan high-performance and high-safety BMS battery protection system

  • Over-discharge protection
  • Over current protection
  • Temperature protection
  • Over charge protection
  • Short circuit protection
  • Battery balance

Battery Detail Overview

  • LED DISPLAY SCREEN

    Battery level clearly visible

    POWER SWITCH

    Conserve battery life

    BATTERY LOCK

    Fixed battery, safer for cycling

  • POWER SWITCH

    Conserve battery life

    COATED SADDLE BATTERY BAG

    Waterproof and easy to move

    PREMIUM CABLE

    High-quality durable

Micro power system

10 years of research and development has gone into creating a versatile and cost-effective product for cyclists. The micropower system offers intelligent assistance with induction brakes that have a response time of 10ms. The system can sense the speed, acceleration and road slope, it will help you automatically when you pedal.

250W high speed brushless permanent magnet

Small size, light weight, high efficiency, stable operation, long life time Planetary gear and clutch:lt's easy to ride even when the battery is dead.

250W
Rated power
500W
Peak power

Power :  250W
Voltage : 36V
Structure :  Gear Drive
Efficiency :  >80%
Maximum torque :  35N.m

ARM Cortex-M3 main chip

With 6-axis gyroscope motion processing chip
Configure Bluetooth Low Energy 5.0
10 pieces of high-sensitivity speed measuring magnets for precise speed measurement

Dedicated APP provides you wonderful cycling experience

you can use the APP to control the wheels, upgrade the firmware, set the assist mode, set the assist level, calibrate the gyroscope angle, and detect the fault. And also you can check the speed, temperature, power, mileage, etc.

Overspeed alarm makes it safer to ride

You can set the overspeed alarm value in the APP. It will alarm when the speed is over the value you set.

5 smart assist modes

We have spent 5 years on developing and optimizing the assist system. The assist system is based on the speed, acceleration, the road slope, and also the assist level that you set in the APP or on the Bluetooth display, calculating out the power you need. it will assist you automatically when you pedal. And we will keep on optimizing the system and publish it from time to time. You will be able to update the system via the APP.

Leisure mode Commute mode Exercise mode Manual mode Climbing mode

Lost bike tracking function You can report lost when your bike is stolen

After you report lost, once the thief tried to connect the wheel with the APP, the system will locate the mobile phone, disable the motor immediatelyand upload the information to the server.

How does it look on your Brompton ?

Welcome to send us your enquiry, we will contact you as soon as possible
The message will be saved after closing the window
 
 
122 REVIEWS - Lvbu EBike Kit-Brompton
Jim Chandler
Germany , 10/27/2026
I love the light weight and simplicity of the kit. I wanted a motor assisted pedal bike, not a pedal assisted motor bike and LVBU bikekit is exactly that. And I can still lift my bike and use a standard bike rack. The price is also very reasonable for the quality. I would have liked a larger battery option, but one can use two batteries if needed.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
David Aguilar
Germany , 10/20/2026
installing it on my bike went flawlessly. I am now able to ride for longer distances then I did before. I am considering buying the larger battery so I can ride even further.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Blue, Blue
EB K
Japan , 10/15/2026
I love it. It gives just enough support to enable longer and more challenging rides while still getting a workout. The instructions for fitting the Frame mount were non existent but other than that, great.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Carey Combe
Germany , 10/12/2026
This has literally transformed my life! However, it is more difficult to attach the wheel etc than you are led to believe.
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Dalibor Ivu?i?
Austria , 10/10/2026
It was fairly simple to install it to my Brompton. (It took about half an hour once I had found the necessary tools. It performs very well and I am very pleased.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Blue, Blue
andrew mussett
United Kingdom , 10/10/2026
Excellent product for my use
Model: KD30S Saddle bag battery 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Zandrew
Switzerland , 10/9/2026
customer support team were very responsive and provide relevant updates/solutions to my queries. Their help has immediately sorted the shipment issue of my order…received the items ordered. Thank you very much! Enjoying my Brompton kit
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: KD40S black, Black
Kean Orsini
Japan , 10/9/2026
The principle of these kits is great, and they are really straight forward to install, on a Brompton at any rate! It was good to ride, powerful and easy to control. I really regret not buying it sooner.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn sliver, sliver
Oliver Wivell
United Kingdom , 9/30/2026
It was fairly simple to add it to my Brompton. It took less than an hour once I had found the necessary tools. It performs very well and I am very pleased.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Zandrew
Switzerland , 9/23/2026
customer support team were very responsive and provide relevant updates/solutions to my queries. Their help has immediately sorted the shipment issue of my order…received the items ordered. Thank you very much! Enjoying much Brompton electric kit ??
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Blue, Blue
Niko
United Kingdom , 9/22/2026
I rated my experience 5 stars overall
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Jorrit De Smet
Belgium , 9/21/2026
The kit was easy to fit my Brompton and works well, making it easier to get my shopping home
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Robert
Germany , 9/20/2026
Pure joy!
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Peter van Vugt
United Kingdom , 9/16/2026
Great kit. Turned my Brompton into an electric one, at a fraction of the cost of an electric Brompton. Feel like it's easily paid for itself twice over by now. Bought a second one for my daughter's (not Brompton) bike. That said, the installation requires you pay attention to what you're doing. But that's true for any electric bike conversion.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Phil
United Kingdom , 9/15/2026
Works exactly as advertised
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn sliver, sliver
Sergio TOM
Germany , 9/14/2026
Light and anonymous, perfect for short commuters. Still possible to use my glorious bike. When charge is over you can still ride lightly.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Dark _GWolf
United Kingdom , 9/9/2026
Excellent piece of kit once fenagled into working - makes my morning commute a breeze.
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Mr Russell Harrison
Canada , 9/8/2026
I absolutely love the conversion kit on my Brompton! It has been a real game changer for me as I now ride my bike a lot more. The only thing that I'd like to see is a longer range on the bottle battery. I'd also like to be able to order another bottle battery without the huge cost of shipping to Canada. If there was another half star to give it would definitely be a 4.5. Well done!
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn sliver, sliver
Clifford Svoboda
Germany , 9/4/2026
Awesome kit!
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Klaus Kirsch
United Kingdom , 9/1/2026
Works brilliantly. ---from a happy rider
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
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