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KY20D Bottle Battery Ebike Kit

Only one cable connection Ebike kit
Super easy to install without special tools

Smart Asssit System / High Efficient Output Arrangement /
Assist Range Upto 90KM / Bluetooth 5.0 / Induction Cut Off System /
Built-in Gyroscope / Road Slope Degrees Detection / All Terrain Application /
Anti-theft Tracking

Just 2 steps to convert a normal bike into a smart E-bike

Most ebike kits are complicated, with dozens of parts which require an expert to fit. The BY sereis Kit can be installed by anyone in just minutes. There are two simple steps to get your ebike up and running:

  • Step 1: Replace the front wheel
  • Step 2: Attach the bottle battery and connect the only one cable to the motor

Fits every size bikes

KY20 bottle battery ebike kit fits all standard bikes. It has mulptiple sizes from 16" to 29" and 700C

Product Specifications

    KY20S / KY20T
    Battery Capacity
    Cell Quantity
    20 cells
    Charging time
    Battery Type
    18650 power lithium ion battery
    AC110V - AC220V,DC42V 2A
    Assist Range

    *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
    Wheel size
    14" / 16" / 20" / 24" / 26" / 27.5" / 29" / 700c
    Rated Power
    250W (MAX500W)
    Motor Structure
    Gear drive
    Motor Efficiency
    Max Torque
    Wireless Connection
    Bluetooth 5.0 (Allows the controller to connect to multiple devices at the same time)
    Charge Socket
    Type C
    Product Dimensions
    Net weight (including rim&tire)
  • 5mins

    Quick installation

  • 14-29 Inches

    Multiple wheel sizes

  • 5 Modes

    Smart Assist Modes

  • 32km/h

    Top speed

  • 250W

    High-speed Brushless Motor

  • 2Drive Ways

    Pedal Assist/Throttle

5.0 Bluetooth Module

5.0 Bluetooth network allows the controller to connect multiple devices at the same time

  • Cadence Sensor
  • Controller
  • 5.0 LCD Display
  • Wepower

Anti-stolen Alarm

Lock the bike in the APP, once the bike is moved the controller will alarm
You can unlock it in the APP to stop the Alarm

Real Time Riding Status

The APP can show the real time status

  • Real-time data
  • Riding Speed
  • Battery Level
  • Devices
  • Temperature
  • Mileage
  • Lock
  • Assist Modes

5 Smart Assist Modes

You can select the proper assist mode for yourself on the APP

  • Leisure Mode
  • Commute Mode
  • Exercise Mode
  • Manual Mode
  • Climbing Mode

ARM Cortex-M3 Main Chip

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

Micro Power Assist System

5 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.

Automatically increase power

Automatically cut off power

Overspeed alarm makes it safer to ride

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

250W/350W High Speed Brushless Motor

Small size, light weight, high efficiency, stable operation and long life
Planetary gear + clutch: no magnetic resistance, even when riding without electricity

Rated Power:      250W/350W
Voltage:         36V
Motor Structure:  gear drive
Efficiency:       >80%
Max Torque:      30N.m

IP65 Waterproof Grade

IP65 waterproof grade makes you ride freely in the rain.

High quality rim, skilled wheel truing process

High-quality carbon steel spokes and high-quality knitting technology, the overall toughness is higher.
The tension of the spokes is 50-110 kgf, and the runout is 0.5-0.6mm.

Powder coating finish

More durable and stronger than painting, not easy to scratch

Type-c Charge and Discharge

It's easy to take the battery off to charge at anytime, anywhere

Easy to check the battery level on the screen on the battery

Black and Silver Bottle Available

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, making this high-quality lithium battery’s lifetime more than 5 years.

  • Over discharge protection
  • Overcurrent Protection
  • Temperature Protection
  • Overcharge protection
  • Short circuit protection
  • Battery Balance

Packing List

  • Motor with rim&tire

  • Bottle battery

  • Controller (Battery holder)

  • Wireless Display with thumb throttle (optional)

  • Charger

  • Cadence Sensor (optional)

Welcome to send us your enquiry, we will contact you as soon as possible
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Will Lvbu kit fit my bike ?

LVBU kit will fit most bikes except thru axle. 

Is Lvbu kit compatible with V brake?

Yes, Lvbu kit is compatible with rim brakes and disc brakes.

And a free new disc can be provided if you need.

Is it safe to use the front wheel drive?

Yes, it’s safe to use the front wheel drive. 

The power of the front wheel motors those lvbu ebike kit use are between 250w to 350w, so there is no safety problem. Actually, there are some advantages to using front motor drive: 

 It is more efficient to pull the bike compared to push the bike.

 The front motor will balance the weight of the front wheel with the rear wheel to make it stabler

 It is much easier to install the front wheel than the back wheel.

What are the functions of the APP?

The APP has two main kinds of functions as following: 

  • Set the parameters:
    ①Search and bind the Lvbu ebike kit: You need to search and bind the kit with the APP when you use it first time.
    ②Calibrate the gyroscope angle: The gyroscope angle must be calibrated after the first time you attach or reattach the kit to your bike.
    ③Set the assist mode or adjust the assist level.
    ④Set over-speed alarm.
    ⑤Set the maximum assist speed (speed limit).
    ⑥Lost report.
    ⑦Firmware upgrade.
    ⑧Restore factory settings.
    ⑨Set the wheel weight, load, wheel size, etc. ...
     After adjusting and setting the parameters, the system will automatically save values instantly.
  • Show cycling data:
    ①Riding speed
    ②Riding mileage: total mileage, current mileage, uphill mileage, etc.
    ③Kit model
    ④Bluetooth address
    ⑤APP version
    ⑥User instructions ...
    We are keeping optimizing the APP all the time, the new version of the firmware and the APP will be released from time to time, you can update it anywhere with the network of your mobile phone.

Do I have to connect to the APP while riding?

No, you don’t have to connect the kit with the APP when you are riding. The assist system is written in the controller, not in the APP. But before the first time you use it, you must calibrate the gyro angle for the bike.
You can set the assist grade in the APP and put your phone in your pocket. The kit will provide proper assist power for you automatically.

What is lvbu kit warranty policy?

For battery, motor and controller, we provide one year warranty.

How does Lvbu kit system work ?
  • Lvbu assist system is an intelligent assist system which can calculate out and provide the proper power based on the speed, acceleration, the slope of the road, and the assist level set in the APP or display. It will provide proper power automatically when you pedal. The motor will not work until the speed reaches 5 km/h. 
  • It will increase the power when it senses the acceleration is positive and decrease the power when it is minus. The system will also increase the power when going uphill and shut down the motor when going downhill. And the kit can also be controlled by the optional wireless thumb throttle. When you push the throttle, the bike will be fully driven by electric power, but when you release it the assist system will kick in again automatically. The introduction of the 5 assist modes is as following:
     * Manual mode: The most often used mode. The users can set a proper assist grade from 0 to 99 for themselves. 0 stands for no assist while 99 stands for the strongest assist. Under the manual mode the user can use the optional wireless display to set the assist grade instead of using smart phone. After setting the assist grade, the wheel will assist automatically.
     * Commute mode: Under this mode, the wheel will have relatively strong assist power all the time. The output curve of the assist grade is as shown above. It is similar to an assist grade of 60% in the manual mode.
     * Leisure mode: The assist power output is as the curve above. It is a curve similar to a damping ratio. Half an hour is a cycle. At the end of the cycle, the assist will become stronger.
     * Exercise mode: This mode has a small assist output. One cycle is also half an hour. After about 10 minutes, the assist power output will become stronger in the rest of the cycle.
     * Climbing mode: The wheel provides a certain assist grade only if the road is uphill that above a certain slope angle. The assist grade and the slope angle can be set in the APP. For example, when you set 2 degrees and an 80 assist grade, the wheel can give you an 80 assist grade when you are on the road with slope angle above 2 degrees.

     Note: Lvbu's intelligent assist system can be upgraded by the APP. We will keep optimizing the algorithm and publishing the new firmware.
How long is the lifetime of the battery?

Lvbu ebike kits use EV 18650 lithium-ion battery cells with class A quality. Working with our own BMS system, the lifetime of the battery is very high. 80% capacity remains after 1,000 cycles. So normally it can last 5 years.

*Note: The definition of one cycle is that charge the battery from 0 to 100% and discharge it fully. For example, if you charge the battery from the 0 to 50% and discharge it to 0, that is 0.5 cycle.

How to connect Lvbu kit with the APP?

Open the APP and allow all the permissions that the APP asks for. And tap the magnified glass icon on the right top of the APP to search for the Bluetooth address. Select the right address of your kit in the list to connect.
*Note: Please connect the kit in the APP, don’t connect it in the operation system of the phone. You don’t need to input any pin to connect. And please make sure all permissions are allowed and the kit is not connected to other devices. The kit can just connect to only one device at the same time.

How does Lvbu wheel recognize uphill?

Lvbu wheel has a built-in six-axis gyroscope, which can sense the slope of the road such as uphill and downhill. But if you want to detect the slope of the road correctly, you must calibrate the gyroscope angle on the level ground first. The way how gyroscope works is as below: 

  • The purpose of calibrating the gyroscope angle is to give the gyroscope a horizontal reference, telling the gyroscope that the current angle is level, so that the gyroscope can detect the slope. 
  • If the gyroscope is calibrated on a downhill road, the gyroscope will regard the downhill road with a certain angle as a horizontal road, but when the bike is on a level road, the gyroscope will sense it as an uphill, in that case the motor will always provide assistance; 
  • If the gyroscope is calibrated on an uphill road, the gyroscope will treat this uphill road as a horizontal road. And when the bike is on a level road, the system will shut down the motor because the gyroscope sense the level road as a downhill road by mistake.

    Therefore, you must calibrate the gyroscope on a level ground, otherwise there will be problem with the assist system.
How to connect LVBU ebike kit with Bluetooth display?

BTC02 Display Connect Method:

  • Please turn off or disconnect the Bluetooth connection on your phone before the Bluetooth display connects to the LVBU Wheel. The wheel cannot connect to more than one device at the same time; 
  • Press the power button of the Bluetooth display to turn it on. Then press the power button three times continuously. The display will search for the Bluetooth address of the lvbu ebike kits nearby; 
  • After the display finishes the search, press the up and down keys to select the right address of your kit and press the power button to connect.

DW03 Display Connect Method:

  • Open the APP and connect it with the Lvbu ebike kit
  • Press the power button of the Bluetooth display to turn it on.
  • Tap the "device" icon at the bottom right in the front page of the APP-->Tap "Add Device"--> Select the display in the list to connect.
Do you have a local dealer or oversea warehouse?

Yes, we have oversea warehouse in Europe.

And for some countries, we do have local dealers. 

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