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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
 
 
72 REVIEWS - Lvbu EBike Kit-Brompton
RANDYH
Korea , 6/10/2026
The motor was relatively easy to install, though it took a bit of time to be methodical. The instructions were well written and supported with images. The converted bike worked great and is a real pleasure to ride. I had one issue that I addressed through customer support, and the support team was fantastic and provided timely replies to my enquiries. I could not be happier with the outcome.
Model: KD30S 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Brian Pascoe
Canada , 6/9/2026
Their customer support is great. Shipping times are a bit slow though.
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Paul Schatzkin
United Kingdom , 6/8/2026
Arrived in good time, packed well, was extremely easy to assemble clear instructions took less than 30 minutes to attach on to the bike. Battery life was perfect for my needs got me to work and back with charge to spare. Would recommend
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Geoff Chatfield
Korea , 5/27/2026
I've been really pleased with it, it was given my Brompton a new lease of life.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
RodA
Malaysia , 5/26/2026
I fitted two conversions, both worked perfectly.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Gregor Van de Velden
United Kingdom , 5/25/2026
The customer service was excellent. It would have been helpful, though, to have a more user friendly website where you could obtain all the information directly that the customer service representative was so kind and patient to explain to me and guide me through. In the end it all worked out really well, though. And the product is simply fantastic.
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
RICHARD
Germany , 5/19/2026
Have 2 bikes with the ebike kits from LVBU which are great and good experience with their customer service dependent.
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Joshi
United Kingdom , 5/14/2026
This is a really great bit of kit. I Swytched my Brompton and it’s better than my actual e-bike. Clever engineering, competitive price.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
hamsup
France , 5/12/2026
Support was quick to respond and very detailed.
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Bogdan
Belgium , 5/11/2026
I needed a brompton wheel replacement and Rao was very understanding and answered all my queries quickly. After payment, the wheel came very quickly in one month. Thank you!
Model: KD30S 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Alan
Malaysia , 4/30/2026
The kit fits well and the performance is even better than we expected. Take time over the fitting. It's not difficult but needs to be right. We had an issue which was immediately resolve by customer service and after a few decent runs are now looking forward to many excursions using electric power to extend our reach. A great way to take a push bike and move it into another league.
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: KD40S black, Black
John Bredehoeft
United States of America , 4/28/2026
Electrified Brompton - I electrified my 6 speed Brompton with the bottle kit. The only drawback is the added weight, but I use this bike for all of my commuting. If you travel I would recommend having 2 of the smaller batteries. TSA is a pain, and is inconsistant. I can go about 35 miles with a fully charged battery. I have had to engage once with support. They have been great although everything happens via online and email. I have found everyone to be responsive. I got mine kit in Sept 2025.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Blue, Blue
Leonardo
Malaysia , 4/23/2026
This is a great kit, well worth the money. I already purchasedand and fitted a Brompton bottle battery kit and use that constantly, with a spare 6AH battery for days when I need to go further and not get the opportunity to recharge on the go.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Blue, Blue
Lee Cook
Korea , 4/22/2026
I previously had a bottle kit on a Brompton which worked perfectly I had an issue with juddering which lvbu fixed by sending me a replacement controller. time will tell about longevity but my previous kit was still going strong after 2 years of commuting most of the battery issues seem to occur over winter but if you store them charged and indoors not in a cold shed or garage it shouldn't be a problem
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Bennett Hardy
Canada , 4/13/2026
The latest kits are absolutely great. They work excellent on my Brompton and I enjoy the flexibilty. I have one small and one big battery. They last 60/90 km. The controller allows for a very natural assistance, even without a torque sensor. The LCD-display is worth the extra cost. Also the online-website is great!
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Red, Red
Marek
Sweden , 4/10/2026
The parts appears to be of very high quality. Installing was very easy. Performance has been very good so far and I feel confident that I will have a long and happy relationship with it. I am seriously considering the purchase of a second unit foru wife's bike if the discount is favourable
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Steve Rance
Malaysia , 4/8/2026
The order process was simple I ended up with a wrong part (my bad) but they sorted it at once. It took a while to assemble I’m not good at following instructions. They were clear and I got there when I followed them closely. I have it on the road now and it rides like a dream
Model: KD30S 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Richard Yip-Chuck
Czech Republic , 4/2/2026
The bike kit for my brompton has been a success but it's not without it's frustrations. The installation was relatively easy but the instructions are not at all clear ... Now it's on and running it's great but the instructions need a rewrite or clear videos in an install section telling you what to actually do ... if it could go wrong it did for me ...
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Gildo Fumagalli
United Kingdom , 3/30/2026
It's a wonderful kit to have on my Brompton. It's made my commuting so much more comfortable and enjoyable. It is value for money.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Red, Red
Ole J?ger
Germany , 3/27/2026
I am really enjoying using my kit on my brompton. Having owned my bike for a very long time but having moved to a very hilly area I wasn't using my bike much. Two weeks in and I am using it regularly. I care for the bike a little better than before. A great bit of kit!
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
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