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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
 
 
82 REVIEWS - Lvbu EBike Kit-Brompton
Peter Grosskopf
Austria , 7/2/2026
I converted my older Brompton to electric and now I'm using it all the time for my daily commute to work (my poor super light Brompton sits in the garage most of the time). Product is beautifully engineered and fits incredibly well with the Brompton fold, super impressed. I've been using the kit for I think nearly a year, it has been very reliable, and the battery remains in good condition. Highly recommended.
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Matthew Alessandri
Germany , 7/1/2026
Had this on my bike for 2 years, been great, only use it when a big hill comes along, and it takes out all the hard work, and means I'm happy to venture further from 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
Sigureur Hauksson
Italy , 6/30/2026
Ordered 2 kits 3 years ago for my wife and I to fit on our Bromptons delivered as promised fitted easily and have ran perfectly since day one ! I have two other e-bikes with Bosch mid drive and I prefer the lvbu kits !
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
Mark Johnstone
Japan , 6/29/2026
The system is the best third party electric upgrade for a Brompton bike! The instal is easy, the system runs smoothly.
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
Ann Halloran
Australia , 6/25/2026
They are always very helpful when I have been in touch.
Model: KD30S Saddle bag battery 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
robert king
United States of America , 6/24/2026
I wasn’t sure how this kit would work on a newly bought Brompton fold up. I was a little hesitant as I didn’t want to add too much additional weight to the bike. I was wrong - the kit is easy to install and actually works a treat. Folding the bike is not hindered by the additional battery and holder etc. The weight is obviously slightly more than the original weight but to be honest it doesn’t make that much difference. The battery can be taken off easy enough and kept in your bag which makes carrying the bike easier. The addition of the kit makes riding the Brompton a breeze round NY without breaking a sweat. Love it ?? Would definitely recommend
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Tim Delesio
Czech Republic , 6/23/2026
Miya helped me diagnose the problem with my unit and help me get back on the road quickly. I really enjoying using my lvbu ebike
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Andrew Hague
Ireland , 6/18/2026
Turned my Brompton into a second car, I use it daily and feel like the health and lifestyle benefits are frankly price less. Easy installation and up and rolling within an hour. Some nags: The battery indicator on the battery and the App are designad by the windows transfer file process guy, i e, they dont match at all with reality and go up and down at any given time, and gives me a huge anxiety on the longevity of the equipment. Also, we're nitpicking, the motor wheel is a lot tough er in resistance than the factory default Brompton, but thats to be expected from all electric al bikes afaik. Would recomend!
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Khaony Huon
Korea , 6/17/2026
A good addition to your regular bike making cycling more enjoyable. What really stood out to me is the rapid response of the customer service to support me with any issues that I dealt with.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn sliver, sliver
Danny Hoang
Singapore , 6/16/2026
Great kit and better support!
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn sliver, sliver
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
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