OKAI EB50 User manual

The manufacturer reserves the right to change and release product firmware
updates and to keep this manual up to date.
https://www.okai.co

EB50
Instruction Manual

01
Contents
02
03
05
06
07
10
11
10
18
19
19
19
20
20
21
07
07
11
19
1-1.Technical Data
1-2.Symbol Explanations
1-3.List of finished product and parts
1.Introduction
2.Intended Use
3.Safety Instructions
3-1.Safety instructions
3-2.Battery safety precautions
3-3.Safety instructions for battery charger
4.How To Use
4-1.Instrallation instructions
4-2.Charging the battery
4-3.Ride preparation
5.Maintenance,Cleaning and Service
5-1.Maintain
5-2.Clean
5-3.Storage and transportation
6.Handling
7.Explanation Of Error Codes

02
Thank you for purchasing the OKAI electric bike.
1.Introduction
OKAI sincerely hopes that you can ride the bike safely and enjoy a comfortable riding experience.
Since riding a bike carries certain risks, please read this practical manual carefully before riding, and
adequately prepare before going on the road. Please keep the instruction manual in case you need it
from time to time. If you give the electric bike to others, please also provide them with this user
manual. Failure to comply with this user manual may cause serious injury to people or cause damage
to the product. OKAI does not assume any responsibility for this. In order to be concise and easy to
read, the OKAI E-Bike will be referred to as “product” in the following Content.

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1-1.Technical Data
Brake
Tire
Brake Stopping Distance
Brake Mode
Tire Size
Tire Material
Front:26inch
Rear:26inch
Pneumatic tire
Front:disc brake
Rear:disc brake
≤10m
Parameter
Rated Power
Max Power
1925*710*1104(mm)
26"
Range
Battery Quantity
Maximum Speed
Adapted Terrain
Operating Temperature
Storage Temperature
IP Rating
Charging Time
Rated Voltage
BMS
Rated Capacity
Swappable Battery?
(Yes or No)
Max Torque
Rated Voltage
Motor Control Mode
—20～45℃
48V
85N.m
48V
750W
1000W
0～40℃
Flat/Mountain land
≤72km（45miles）
Battery
Parameter
Motor
Parameter
N.W. 38kg
32 km/h (20mph)
2.8A<6H
IPX5
14.7Ah
Yes
Negative point port
39Pcs
Brushless gear reduction motor
Item Content EB50
Dimensions (unfolded):
LxWxH
Frame Size

04
*Specifications are subject to change without prior notice.
*Range: When fully charged, with a load of 75kg, an ambient temperature of 25°C, driving on a flat
road with human-assisted.
*Factors affecting the range include: speed, ambient temperature, climbing, number of starts and
stops, etc.
Item Content
Charger
Rider
Features
Packing
Input Voltage
Output Voltage
Output Current
Max Load
AGE Recommended
Height Required
Brake Light
Riding Mode
Certification
Manner Of Packing
G.W.
EB50
150kg
2.8A
54.6V
100-240V
45.5kg
Normally on
Zero start (rear drive)
FCC、CPSC
140~200cm
>14 years old
1pcs/ctn

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DANGER
WARNING
CAUTION
Indicates a hazard signal with a high degree of danger. If not avoided, death or
serious injury may occur.
A hazard signal that indicates a moderate hazard. If not avoided, death or
serious injury may occur.
A hazard signal that indicates a lower hazard. If not avoided, mild or moderate
injury may occur.
This symbol marks additional information and instructions about the product
and its use.
Please read the instruction manual carefully before use.
This product is a second-class protection product.
Positive and negative display.
Wear personal protective equipment(PPE).
Please do not use this product after taking alcohol, sedatives or psychotropic drugs.
Minimum age: 14 years old.
Do not enter the road with these signs.
1-2.Symbol Explanations

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1-3.List of finished product and parts
Size: length 1925*width 710*height 1104mm
Buttons
Headlights
Eight speed shifter
Display
Brake lever
Front fender
Charging port
26*4.0 in Rear
wheel group
Pedal
Cushion
Battery key port
Front quick
release
Front and rear
disc brake
Rear fender
group
Rear motor

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2.Intended Use
3.Safety Instructions
3-1.Safety instructions
This section lists the safety instructions that should be followed when using this product.
·An electric bike is intended for sport and entertainment purposes, not for use as a means of
transportation, but the transportation faction of the product once you drive it into public areas (as
permitted by the laws and regulations of your region and country)also carries potential safety risks for
all vehicles. Drive strictly in accordance with the instructions in this manual to ensure the safety of
yourself and others to the utmost extent, and to ensure compliance with national first-level traffic
laws and regulations of various provinces and cities, such as traffic regulations, etc.
·Please note: Once you drive an electric bike on public roads or other public places (as permitted by
the laws and regulations of your region and country regarding the use of electric bike on public roads
or other public places), even if you fully comply with this safe driving guide operation, you may also
face risks caused by illegal driving/improper operation by others, or other vehicles. Just like when
walking or riding a bicycle, you may also be injured by other vehicles. As with any vehicle, the faster
you drive an electric bike, the longer the distance required to brake, and emergency braking on
smooth surfaces may also cause the wheels to slip and lose balance or even fall over. Therefore, it is
very important to be vigilant when driving, maintain a proper speed, and maintain a reasonable and
safe distance from other people and vehicles. When driving on unfamiliar terrain, stay alert and drive
at a low speed.
·Please respect the pedestrian's right of way when driving. Avoid frightening pedestrians, especially
children.
·When driving in countries and regions where there are currently no national standards and
regulations related to electric bike, such as China, please be sure to comply with the safety require-
ments for drivers in this manual. Zhejiang Okai Vehicle Co., Ltd will not bear any direct or joint
liabilities for any financial losses, losses of life, legal disputes, or any other unfavorable events that
occur due to the violation of the recommended uses indicated in this manual.
·To avoid potential injury, do not lend the electric biker to people who can't operate it. If you give the
electric bike to a friend to use, please be responsible for your friend's safety, teach them to operate
the bike, and tell them to wear protective equipment.
·Please perform a basic inspection of the electric bike before each driving. If you find that there are
loose parts, the battery life is obviously reduced, the tires are excessively worn, the steering makes
abnormal noises or malfunctions, etc., please stop using the bike immediately, and do not force it to
drive.
It may be dangerous to use this product! Learn to use the product step by step and spend enough
time in practicing. Please follow all the tips and warnings set forth in this manual to reduce risk of
injury. Even if you have enough practice, guidance or expertise, you may still lose control, collide or
fall over, which may cause serious harm to yourself or others.
1. Keep the printed instructions for further reference and read carefully before use.
2. Maximum speed allowed: 32 km/h (20mph)
3. Pregnant women, the disabled, and those who suffer from heart, head, back or neck conditions (or
have undergone operations on these parts) should not use this product.

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4. Do not use this product after taking alcohol, sedatives or psychoactive drugs.
5. Keep a distance of at least 1m/3ft from pedestrians, other vehicles and any obstacles.
6. This product can only be used when the environment permits it and the personal safety of
bystanders is guaranteed.
7. Pay attention to the obstacles in front and of those far away.
8. This product may be used by only one person. It is forbidden to use this product with others. Don't
make sharp turns when driving the bike at high speeds.
9. Avoid sudden acceleration or sudden braking; do not lean your body for acceleration.
10. Excessive forward or backward is strictly prohibited.
11. Do not misuse this product. Do not use this product on roadsides, ramps, in skate parks, empty
swimming pools, or any place similar to sliding plates.
12. Do not use this product to cross obstacles, slopes, ice or snow, nor climb up or down steep slopes,
stairs or escalators. Do not expose this product in the rain.
13. Do not use this product in places where the depth of the puddle exceeds 10cm / 3.94in, because
water may enter the motor.
14. Don't jump on this product. Don't try to use this product to do any acrobatics or activities not
intended.
15. In order to avoid distraction when riding, please do not wear earphones, earplugs, make or
answer calls, take pictures or videos or do any activities that are not related to riding so that you may
maintain an awareness of your surroundings at all times.
16. Be sure to hold both handles when riding.
17. Avoid using this product at night or in places with poor visibility.
18. When you encounter pedestrians or other obstacles, check if you can pass safely.
19. Please use this product and its accessories at an appropriate temperature. Pay attention to the
temperature requirements for battery charging.
20. Please always wear personal protective equipment (to protect wrists, knees, head and elbows)
suitable for your weight and size to avoid injury. In working areas, local laws or regulations may have
minimum requirements for helmets. In addition, it is suggested that safety mirrors be worn.
21. According to French traffic rules, reflective clothing and helmet is strongly required when riding.
22. Do not hang this product with other products or vehicles.
23. When not used, this product should be parked with the kickstand.
24. Any load added to the handle will affect the stability of the bike.
25. WARNING! The braking distance will be extended under humid conditions.
26. WARNING! If any mechanical parts are subject to great external pressure and wear, different
materials and parts may react differently. If a part exceeds the expected service life, it may suddenly
break, which may cause injury. Cracks, scratches and discoloration in the area affected by external
pressure indicate that the part has exceeded its service life and should be replaced as soon as
possible.
27. Please spend enough time practicing how to use this product, so as to avoid accidents caused by
lack of skills.
28. If training is required, the seller may provide corresponding training tutorials
29. When you are approaching pedestrians or cyclists, you may ring the bell to alert them.
30. When passing a protected passage, please dismount from the bike and walk through it.
31. Pay attention to protect your own safety and the safety of others in all cases.
32. Do not use this product for other purposes such as carrying people and objects.
33. Using the brake for long durations may cause it to heat up. Avoid touching them to prevent burns.
34. Regularly check all bolts and screws, especially the axles, folding system, steering system and
brake shaft.

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35. It is prohibited to refit this product, including steering tubes, steering sleeves, steering rods,
folding mechanisms and rear brakes.
36. Accessories and any additional items which are not approved by the manufacturer shall not be
used.
37. When riding, the noise should not exceed 70dB.
38. When using the product, users must wear shoes.
39. This appliance can be used by children aged from 14 years and above and persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge if they have been given
supervision or instruction concerning use of the appliance in a safe way and understand the hazards
involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be
made by children without supervision.
40. Traffic in the city has many obstacles to cross such as curbs or steps. It is recommended to avoid
obstacle jumps. It is important to anticipate and adapt your trajectory and speed to those of a
pedestrian before crossing these obstacles. It is also recommended to get out of the vehicle when
these obstacles become dangerous due to their shape, height or slippage.
41. Get closer to your seller so he can refer you to an appropriate training organization.
42. Avoid high traffic areas or overcrowded areas.
43. In any case, anticipate your trajectory and your speed while respecting the code of the road, the
code of the sidewalk and the most vulnerable.
44. Notify your presence when approaching a pedestrian or cyclist when you are not seen or heard.
45. Cross the protected passages while walking.
46. In all cases, take care of yourself and others.
47. Power-off the vehicle during charging.
48. Do not divert the use of the vehicle.
49. This vehicle is not intended for acrobatic use.
50. Caution! The brake may become hot while in use. Do not touch the brakes after use.
51. Regularly check the tightening of the various bolted elements, in particular the wheel axles, the
folding system, the steering system and the brake shaft.
52. Eliminate any sharp edges caused by use.
53. Do not modify or transform the vehicle, including the steering tube and sleeve, stem,folding
mechanism and rear brake.
54. The self-tightening nuts as well as the other self-tightening fastenings may lose their efficiency
and that they may need to be retightened.
55. WARNING! As with any mechanical component, a vehicle is subject to high stresses and wear.
The various materials and components may react differently to wear or fatigue. If the expected
service life for a component has been exceeded, it may break suddenly, therefore risking causing
injuries to the user. Cracks, scratches and discoloration in the areas subject to high stresses indicate
that the component has exceeded its service life and should be replaced.
56. In order to prevent theft, it is recommended that physical lock be used when the bike is not in use
to secure it.
57. WARNING!Risk of Fire and Electric Shock ‒ No User Serviceable Parts.
58. Prolonged exposure to UV rays, rain and the elements may damage the enclosure materials, store
indoors when not in use.
Failure to use common sense and heed the above warnings will increase the risk of serious injury or
even death, so be careful!

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·The battery should not be exposed to excessive heat such as sunlight, fire or the like. Otherwise
there will be a risk of explosion!
·If this product is not used for more than 30 days, please fully charge the battery.
·Fully charge the battery every 90 days. Otherwise, the battery will conduct self-discharge and be
damaged.
·If the battery emits a strong smell or becomes hot, stop using the product immediately. Do not open
the product casing and don't try to disassemble the battery by yourself.
·Please dispose of the battery correctly and safely.
3-2.Battery safety precautions
3-3.Safety instructions for battery charger
·Please use the original battery charger provided with the product for charging.
·The battery charger is not suitable for children under 14 years old, people with mental disorders,
those who are disabled, etc., unless they use this product under the supervision or guidance of their
guardians.
·Check again whether the power plug and cable are damaged. If so, they must be replaced by the
manufacturer, a designated service agent or a person with similar qualifications to avoid danger.
·Before cleaning, storage and transportation, disconnect the battery charger from the power source
and allow it to cool down.
·Protect electrical components from moisture. When the battery charger is cleaned or used, do not
immerse it in water or other liquids to avoid electric shock. Do not put the battery charger in water.
When being charged, this product must be placed in a well-ventilated place. After the battery is fully
charged, immediately disconnect the charger from the power source.
·Regularly check whether the battery charger is damaged. A damaged battery charger must be
repaired before use. Do not use a battery charger that has been left exposed for a long time or
damaged.
·Do not connect a damaged product to the battery charger. There is a risk of electric shock!
·Do not disassemble the battery charger. Repairs must be performed by reliable after-sales service
personnel. Incorrect assembly may cause fire or electric shock.
·Do not use the charger near flammable and explosive items, otherwise there is a risk of fire and
explosion.
·Please check the technical data before connecting the battery charger to the power source.Improp-
er use may cause fire! The battery charger should be used indoors only.
·Do not misuse the battery charger. The battery charger is only suitable for this product. Use with
other products may cause fire or electric shock.
·Make sure that the battery charger and the charging port are properly connected and not blocked
by foreign objects.
·Keep the charging port clean, dry, and free from dust and humidity. Do not put any objects on the
battery charger, and don't cover it. Otherwise, the battery may overheat.
Do not place the battery charger near any heat sources.
·Be sure to place the power line in places where no one may trip, step on, or damage it, Otherwise
there will be a risk of material damage and personal injury.
·Do not disconnect the battery charger from the power source by pulling the power line. Please
manually remove the plug.
·Do not attempt to charge non-rechargeable batteries.

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2. Open the box, remove the top three pieces of foam,take out the accessories box.
1. Cut the packing straps，remove the white plastic buckle under the package.
4.How to use
This section provides information on how to use the product correctly. To ensure user safety and
service life, it is important to follow these instructions.
4-1.Instrallation instructions
White plastic buckle
X1X1 X1X2X1 X1 X1X1 X1 X1X2
Foam
Accessories
box

3. Lift the carton and take out the rear wheel fixed foam.
4. Take out the front wheel.
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Front wheel
Front fender

13
5. Install the handlebar.(Tighten M5 screws with a hex screwdriver,connect wiring terminal.)
7. Install fenders.(Tighten M6 screws with a hex screwdriver)
6. Get the vehicle out of package, remove the packaging, put down the kickstand.
M5M5
locknut
M6
1 2
3
Wiring
terminal

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Front fork
b. Insert the quick release skewer into the front
wheel hub,Tighten the quick release skewer.
c.Fixed fender support frame
(Tighten M5 screws with a hex screwdriver)
Quick release
skewer
a. Align the front wheel hub with the front fork .
9. Front wheel installation procedures:
8.Remove the Protection stents and disc brake protection plate respectively.
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Front
wheel hub
10. Install pedal (Tighten with a no.15 wrench).
Cranks
Pedals
No.15 wrench
Protection
plate
M5
Protection
stents
fender
support
frame

11.Wear a helmet and protective gear.
15
13.Check that the brake levers are working properly.
14.Stand with one foot on the pedal and leave with the other and start to slide.
12.Long press the power button，the display
screen is lit to indicate that the start up
is successful.
Brake lever
Brake lever
Disc brake
Disc brake
Power on button

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16.Stop pedaling to reduce speed and squeeze brake lever to brake.(Left brake lever controls front
wheel braking, right brake lever controls rear wheel braking).
17.To change the center of gravity while turning, turn the handlebar slightly.
15.Place your other foot on the pedal to keep your feet steady. Focus and keepbalance on yourself,
step on the pedal for acceleration. For your safety, the motor won't start until the bike reaches 3.1
MPH (5 km/h).

18.Activate the app
Please scan the QR code to download the app (the system version and Bluetooth version are subject
to the actual requirements of the app). You can find the cruise control function in the app, and
discover more ways to use the bike.
①Install APP, please register/login
③Watch the driving guide ④Start exploring a new riding experience
Now, you can use your bike, check the status and detect the ride through the app.
② Open the app, click "Search for Device".
Follow the app prompt to pair with and
connect to the bike.
17

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4-2.Charging the battery
·Charger connector
·Folding key
Use the NFC icon side of the folding key to touch the display, or press the power button on the
handle bar to power on.
·Function button
Power button: Long press the power button to power on/off.
Light button: Press the light button once to turn the headlights on/off while the bike is powered on;
Gear button: Press"+"\"-" to adjust 0-3 and pedestrian gears;
0 gear: motor will not output power;
1-3 gear: Motor power increases gradually;
Pedestrian gear: Press "-" in 0 gear to enter the pedestrian gear. Long press "-" to make motor output
power ,which is suitable for use on pavement.
Plug in power
Connect to the vehicle
charging port
Light button
Gear button
Power on button
Note: For first use, please connect the charger to activate vehicle.
Charging port