a2b Kuo+ User manual

1Owner’s manual Kuo+

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Contents
1.0 Introduction 4
2.0 Important information 5
3.0 Unpacking 6
4.0 Your A2B Kuo+ 7
5.0 Assembly and adjustments 9
6.0 Getting to know your A2B Kuo+ 12
7.0 Battery use, storage and disposal 19
8.0 Pre-ride checks 23
9.0 Maintenance 25
10.0 Safe and responsible riding 27
11.0 Cleaning the vehicle 29
12.0 Troubleshooting 30
13.0 Technical data 31
14.0 Warranty and safety notes 32
15.0 Disposal 33
16.0 Owner registration 34

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Owner`s manual
1.0 Introduction
Welcome and congratulations on buying your new A2B Kuo+, the electric bike that’s taking transport in a whole new direction. It’s the
revolutionary way to get to work, visit to the shops or just get some fresh air. Compared to jumping in the car, an ebike is a lot more fun,
easier to park and will reduce your fuel costs as well as your impact on the environment… as you’ll soon find out!
Feeling energetic?
You can ride your new A2B Kuo+ powered off and then switch the assistance on for hills and headwinds.
WARNING
• Wear light fluorescent clothing at night.
• Your existing insurance policies may not provide accident cover for your A2B Kuo+*. Contact your insurance company or agent
for information.
• This owner’s manual makes no representation about the safe use of the A2B Kuo+ under all conditions. See your A2B dealer for all
service, repairs or maintenance and for referral to suitable classes, clinics and books on cycling.
Hero Eco
www.wearea2b.com
*’ A2B Kuo+ electric bike will be referred to as "A2B Kuo+" throughout of this manual.
A2B Global Head Office
Hero Eco Ltd
80 Coleman Street
London EC2R 5BJ
Germany
Hero Eco Ltd
Reichenberger Strasse 124
10999 Berlin
USA
Hero Eco Inc.
207 9th St.
San Francisco, CA 94103

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WARNING: This indicates a potentially hazardous situation which, - if not avoided, could result in bodily injury or death, in
addition to property damage.
CAUTION: This indicates a potentially hazardous situation, - which if not avoided, may result in damage to equipment or
inadvertent system failure.
2.0 Important Information
This owner’s manual contains important safety, performance and service information.
Please ensure that users of your A2B Kuo+ read and understand the following important warnings and cautions before their first trip.
If you have any questions or are not sure about any instructions in this owner´s manual ask your A2B dealer.
Read and understand the following warnings and cautions.
If your A2B Kuo+ is used by others, please show this section to them so that they are aware of these important warnings to reduce the risk
of an accident.
Important terms
Throughout the manual, the following symbols and terms call your attention to important warnings, cautions and notes. Read, understand
and follow them whilst using your A2B Kuo+.

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Owner`s manual
3.0 Unpacking
LIFT WITH CARE: Two people are recommended.
Your A2B Kuo+ weighs 19 kg (42 lbs).
3.1 Tools and equipment
• Pliers.
• Side cutters (for cutting cable ties used in packing).
• Blanket or tarpaulin (to avoid scratching unprotected surfaces).
3.2 Delivered fully assembled and battery charged
Your A2B Kuo+ should be fully assembled and the battery charged
by your A2B dealer at the time of delivery. However, if you need to
unpack your bike, follow these instructions:
1. Carefully open the flaps at the top of the carton. Remove all
staples (with pliers if necessary), to avoid scratching yourself or
your bike.
2. Carefully lift the bike out of the carton. Two people are
recommended.
3. Lay the bike on a tarpaulin or blanket to avoid scratching any
unprotected surface whilst you remove the packing materials.
4. Remove the accessory boxes from the carton.
5. Using the side cutters, clip the cable ties that hold various
components to the frame. ONLY clip those cable ties that are
used to attach components to the frame or prevent movement
during shipment (and NOT those trimmed of excess length).
The A2B Kuo+ has cable ties that manage electrical and control
cable routing (and ARE trimmed of excess length). DO NOT clip
these cable ties as they are necessary for the safe operation of the
vehicle.
6. Remove all of the protective wrapping from the bike and dispose
of the packaging responsibly.
7. The battery and charger should be tested when received. If the
battery or charger is damaged in any way, a claim should be filed
with the carrier. A full report of the damage should be obtained
by the claim agent, and this report should be forwarded to
Hero Eco. Hero Eco or its agent will advise the action required
and arrange for repair or replacement.
Make sure the battery is fully charged before using the A2B
Kuo+ for the first time. How to handle the battery and how to charge
please see section 7.2 & 7.3

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1. Seat
2. Seat post
3. Seat post clamp
4. Main frame folding mechanism
5. Left side brake lever
6. Display
7. Gear shifter
8. Right side brake lever
9. State of charge indicator
10. On / Off battery switch
11. Charger port
12. Handle bar folding mechanism
13. Frontlight
14. Front wheel
15. Front fork
16. Front brake
17. Pedal, crank arm and chain ring
18. Drive chain
19. Motor cable connector
20. Battery
21. Kickstand
22. Rear brake
23. Motor
24. Rear derailleur 7 speed gear set
25. Rear wheel
26. Rear light
4.0 Your A2B Kuo+
4.1 Components
2
3
14
16
17
21
18
25 23
22
15
24
19
6
8
5
13
4
12
11
10
9
7
20
26

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Owner`s manual
4.2 Changing components or adding accessories
Read, understand and follow the instructions that accompany the
products you purchase for your A2B Kuo+.
Before installing any component or accessory, including a
different size tyre, make sure that it is compatible with your A2B
Kuo+ by checking with your A2B dealer.
ALWAYS: Follow the component manufacturer’s instructions if
they conflict with these instructions.
Failure to confirm compatibility, properly install, and operate
and maintain any component or accessory can result in serious
injury or death.
Using non-genuine components or replacement parts may
compromise the safety of your bike and void the warranty. Check
compatibility with your A2B dealer before changing any
components.
If you change components or add accessories, you do so at
your own risk because Hero Eco may not have tested that
component or accessory for compatibility, reliability or safety on
your A2B Kuo+.

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5.0 Assembly and adjustments
5.1 Delivered fully assembled and adjusted
Your A2B Kuo+ should be fully assembled and the battery charged
by your A2B dealer at the time of delivery. However, if you need to
unpack your bike, follow these instructions.
Failure to properly assemble and adjust your A2B Kuo+ prior to
use may result in an accident resulting in death, serious injury and/
or property damage. If you are uncertain about any aspect of the
assembly and adjustment of your bike contact your A2B dealer.
There are no user serviceable elements in the motor, motor
controller, battery, battery charger, or wiring harness of your A2B Kuo+.
DO NOT disassemble or adjust any of these components. This may
cause extensive damage to these components, void your warranty,
and may cause hazard. If you cannot resolve a problem using the
information in this owner’s manual contact your A2B dealer.
5.2 Tools and equipment
• 4mm allen key
• 5mm allen key
• 6mm allen key
• Small Phillips screwdriver
• Light grease (white lithium grease or equivalent)
5.3 Installing the Seat Post
1. Ensure that the seat post quick release lock is in the open
position (image A).
2. Insert the saddle post stem into the seat post down tube (image B).
3. Lock the quick release mechanism by pushing the lever towards
frame, ensuring that it does not protrude so as to cause injury to
the rider (image C).
It is recommended that you adjust the tightness of the quick
release lever manually by either loosening or tightening the lock nut,
prior to securing the seat post.
BA C

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Owner`s manual
5.4 Installing pedals
The pedals on the A2B Kuo+ arrive fully fitted and functional
To fold the pedals:
1. Hold the bike secure and upright and press the outside of the
pedal in direction of the bike.
2. The pedal will then depress, enabling you to fold the pedal to the
left or to the right.
3. To open the pedal. Press again the pedal towards the bike and
then move the pedal through 90 to the central open position.
4. Ensure that the pedals are locked tight before attempting to ride
the bike.
An improperly opened pedal may fold close whilst in use.
This may cause an accident resulting in serious injury or death and
property damage. Ensure that your pedals are properly unfolded
and clicked into place before each ride.
5.5 Brake lever adjustment
Can you comfortably operate the brakes? If not, take your A2B
Kuo+ to your A2B dealer and ask them to adjust the angle of the
brake levers.

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5.6 Seat height adjustment
The seat may require adjustment.
Ask your A2B dealer to adjust it before you ride.
To determine the correct height of the seat for the rider
1. Straddle the assembled A2B Kuo+ with your feet shoulder width
apart and flat on the ground.
2. There must be at least 25 mm (1inch) clearance between the
intersection of the main tube and the seat post and the crotch of
the rider.
3. The minimum inside leg height is measured from the intersection
of the top tube and seat post plus 25 mm and the floor. The
minimum inside leg height for this bicycle is 50 cm (20 inches)
Height adjustment:
1. The seat height can be adjusted by
releasing the quick release lever, then
raise or lower the seat accordingly and
tighten the quick release lever when the
desired height is achieved.
2. After adjustment, check to ensure the
lever is tightly fastened and ensure there
is no movement in the seat post in any
direction.
3. The seat post clamp should be securely tightened.
Failure to correctly secure the seat can result in serious injury or
death.
DO NOT raise the seat beyond the ‘minimum insertion’
mark identified on the seat post.
Inside Leg Height
Frame Height Frame Height

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Owner`s manual
6.0 Getting to know your A2B Kuo+
Do you fully understand how to use your A2B Kuo+? If not, before
your first ride, ask your A2B dealer to explain any functions or
features that you do not understand.
6.1 Starting and stopping
1. Choose a quiet area away from cars, other cyclists, obstacles or
other hazards.
2. Ensure that the power is OFF and raise the kickstand into the
riding position.
Mounting the bike with the power ON may result in activating
the pedal operated torque sensor and the bike may surge forward,
potentially resulting in serious injury or death and property damage.
For the same reason, turn the power OFF before dismounting.
DO NOT sit on the bike whilst it is supported by the kickstand,
you will damage the kickstand and possibly the frame.
3. Mount your bike and get comfortable.
4. Turn the battery power ON.
5. Select the low setting on the power control module (S).
6. Gently pedal and away you go - assisted by the intelligently
delivered A2B power hub.
7. Test the brakes at slow speed. Left lever actuates the rear brake
and the right lever actuates the front brake for the UK, Australia
and New Zealand. For all other countries the reverse applies. Put
your weight forward and gently apply the brakes, rear brake first.
8. Check out the handling and response of your A2B Kuo+.
Sudden or excessive application of the front brake could throw you
over the handlebars. Applying brakes too hard can lock up a wheel,
which could cause you to lose control.
No power? Here are some solutions. If they DO NOT solve your
problem ask your A2B dealer for help.
Problem Possible CausesSolution
The bike does not
turn on.
Dead battery. Recharge battery
See sections 7.2
and 7.3.
The bike turns on,
but the motor does
not run (state of
charge indicator
LED’s Illuminate).
1. A brake lever is
applied.
Do not apply the
brakes when starting.
Make sure brake
levers are fully forward.
2. The motor
power connector
is unplugged.
Ensure motor power
connector is securely
connected.

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When applying the brake levers the motor will automatically cut
out. This is a safety feature.
Your A2B Kuo+ allows for gradual application of power, and
allows for adjustment of power between OFF and FULL. This
feature enables you to adjust the speed at which you are most
comfortable by the amount of torque or pressure that you apply to
the pedals. See Section 6.4.4
Your A2B Kuo+ will provide instantaneous power when you are
pedalling. To conserve battery power and increase your range,
ALWAYS use the gears as much as possible – just like you would
on a non-powered bicycle.
Remember that there are power cut off switches integrated into
the brake levers. When you apply the brakes, power to the motor will
turn OFF. Therefore, DO NOT hold the brake lever(s) when you want
the motor to run.
Motor power and
motor control
connectors

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Owner`s manual
6.2 State-of-charge indicator
The state-of-charge (SOC) indicator on the command module
displays the percentage of charge remaining in the battery whilst
you are using your A2B. When the battery is below 20% it should
be charged as soon as possible.
The motor controller and battery management system (BMS) are
designed to turn off the power to the motor when the voltage of the
battery drops to a predetermined point. This is to protect the battery
from the harmful effect of over-discharge.
The display also shows the battery voltage. This allows you to keep
track of the health oft he battery. See Section 6.4.6.
Never attempt to use remaining power once the BMS has
switched off the battery. You will damage your battery. When the
power turns off due to a low battery, plug the battery into the
charger supplied with your A2B Kuo+ to recharge the battery. It will
take 5-6 hours to fully recharge a completely discharged battery.
See Sections 7.2 & 7.3.
6.3 Gears and shifting
Your A2B Kuo+ has a 7-speed Shimano gear set controlled by a
trigger shifter on the right hand side of the handlebar. To shift gears,
pedal at a steady pace and click through the gears until you find
the gear most comfortable for you and the current conditions. To
downshift, to make pedalling easier (when encountering a hill), click
the lower thumb trigger to select a lower gear. This will down-shift
your A2B Kuo+, but will also make you pedal faster to achieve any
given speed.
To ride faster (on a flat section or a downhill), click the upper thumb
trigger to select a higher gear. This action will up-shift your A2B
Kuo+, allowing you to pedal more slowly for a given speed, but with
more effort required.
ALWAYS pedal forward at a steady pace when shifting gears.
The gears operate independently of the motor. To maximise the
range that you can ride with electric assistance, and to give yourself
a pleasant aerobic workout, maximise use of the gears to assist the
motor. The VPAC torque sensor uses a combination of pedal and
motor power to achieve your desired speed. Using the trigger
shifter, adjust the gear setting to find a gear that makes pedalling
comfortable whilst assisting the motor.
Consult your doctor before undertaking any form of physical
exercise and for guidance regarding aerobic workouts.

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6.4 Power Control Module (Display)
The A2B Kuo+ uses the display for controlling the amount of
powered assistance the motor provides.
The Display on your A2B Kuo+
is mounted on the left side of the
handlebar.
The Display has three buttons to
operate the assistance system and
to change in between the different
displayed readouts.
6.4.1. Button Definition
6.4.2. Location of displayed information
Assist Mode
State of charge as percentage
Km/h, MPH, Cycles, Voltage, Tem-
perature, Maximal speed limit
State of charge in bars
TRIP : mileage for single trip
ODO: Mileage for total
6.4.3. Switching the bike On and Off
Before switching on the display turn the battery on. To switch
the bike on press the On/Off button briefly (0.5 second).
To turn the bike off hold the On/Off button (minimum 2
seconds) down for two seconds. This will switch off the display.
Please also switch off the battery.

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Owner`s manual
6.4..4 Changing Power modes:
The electrical system of the A2B Kuo+ is offering you six power
modes.
Mode 0 is the mode without power supply from the system
(rides without power assistance). Mode 1 to 5 gives you power
assistance with Mode 1 giving the lowest assistance, ranging up
to Mode 5 which maximum assistance, enabling you to reach a
maximum speed up to 30.2 km/h = 18,7 mph (Europe 25 Km/H
=15.5Mph) pending on various external factors as e.g. rider weight,
wind, terrain etc.
The default Mode is Mode1; each time you press the Mode
button increases the assistance by one level. Once you pass Mode
5 it returns back to Mode 0 without any assistance.
6.4.5. Riding speed indicator
Default speed unit is KM/H, by pressing the info button its
interchanges between km/h and mph.
6.4.6. Battery Management System (BMS)
BMS system will indicate battery state of charge in bars, the state
of charge in percent, the total battery discharge cycles (CYCLES),
the battery voltage (V) and the battery temperature (°C).
After switching on the system, push down and at same
time the screen will show the discharge cycles; push down
again then it will show the voltage of battery.
One more time press down the temperature of the battery will
be shown.
For returning back to the main interface press at the
same time and .
6.4.7. TRIP and ODO indicator
Default setting after switch on the display is TRIP. Pressing the
button alternates to ODO mode to show the total accumulated
mileage.
To interchange between these two just press button.
6.4.8. Backlight function
Switch on the display, hold the button for 3 seconds switching
on the backlight.
To switch off the backlight press the button again for in 3
seconds.
6.4.9. Standby mode
With the system switched on and without any power output for 10
minutes the system will automatically go into the Standby mode in
order to save energy.

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6.4.10. Error codes
In the case of an error occurring, the display will indicate an error
code from the list of errors defined below:
Error code Definition
20 Battery communication abnormal
21 Current abnormal
22 Throttle signal abnormal
23 Phase of motor missing
24 Hall sensor of motor abnormal
25 Brake switch abnormal
30,31 Communication between display and controller
abnormal
6.4.11.Power assistance options
The A2B Kuo+ has two types of
assistance for you to choose from,
Power on Demand via the Throttle,
or Pedal Assist. They can either be
used simultaneously or individually.
Left side of your display at your
handlebar you will find the Thumb
Throttle.
Power on demand via the throttle
Apply motor power by pressing the thumb throttle.
The electrical system of your A2B allows for gradual application
of power, and allows for adjustment of power between OFF and
FULL. This feature enables you to set that speed at which you are
most comfortable.
The electrical system of your A2B will provide instantaneous power
whether you are pedalling or not. Therefore, there is no need to
pedal as you start-up.
However, the motor consumes more power during a start from a
standing stop than at any other time. More power is consumed
during start-up than even climbing a steep hill. Therefore, in order
to conserve battery power, and increase your overall range, pedal
during a start from a standing stop to reduce the load taken
from the battery.
Remember that there are power cut-off switches imbedded in the
brake levers. When you apply the brakes, power to the motor will
turn “OFF”. Therefore, do not hold the brake lever(s) when you want
the motor to run.
Pedal assist
Choose a level of assistance on the display and begin pedalling.
The electrical system of your A2B allows for application of power
according to the pedal assist settings chosen. The are five support
levels (see also changing support modes) . This feature enables
you to set the speed at which you are most comfortable.
The electrical system of your A2B will provide instantaneous
power when you begin pedalling. However, the motor consumes
more power the higher the chosen assistance level is.

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Owner`s manual
Maximise your range
• Fully check your battery before each ride.
• Check tyre pressure regularly and inflate to 40 psi (or stated
pressure printed on the tyre sidewall).
• Have your A2B Kuo+ serviced periodically to ensure that the
front bearings turn freely and both brake caliper DO NOT rub the
brake shoes when they are not applied.
• Minimise the weight that you carry.
• Ride at slower speeds.
• Accelerate more slowly as you move to your cruising speed.
• Keep the chain and derailleur lubricated with a chain spray
recommended for bicycle use.
6.5 At the end of your ride
You should turn off your display and battery before storing.
If you have any questions, or if you feel anything about your A2B
Kuo+ is not as it should be, ask your A2B dealer before you ride
again.
6.6 Recharge your battery
Fully recharge your battery as soon as possible because a lithium
ion battery left in a discharged condition deteriorates much faster
than a fully charged battery. See Sections 7.2 & 7.3.
6.7 Understanding the range of your A2B Kuo+
Factors affecting range:
• Battery state-of-charge.
• Tyre inflation pressure.
• Front wheel bearings and both brakes (tight bearings or a
dragging brake shoe reduces range).
• Rider weight (it takes more battery power to accelerate a heavier
person).
• Your speed and local wind conditions (range is reduced when
travelling fast against a strong wind).
• Terrain (travelling on a soft or rough surface or climbing a hill uses
more power).
• Lots of starts and stops (full power from a standing start draws
the most current or amperage from the battery).

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7.1 Using the battery
For the proper use, maintenance and storage
of this battery it is important that you read and
understand these instructions. Use ONLY the
battery supplied with your A2B Kuo+.
Failure to properly use and store this battery
will void the warranty and may cause a hazardous situation. DO
NOT use this battery with any other vehicle or appliance. Use of
this battery with any other product will void the warranty, and may
create a hazardous condition and cause a fire resulting in severe
injury or death and property damage. If you have any questions
about this battery or its usage, contact your A2B dealer.
Never short-circuit the discharge terminals of the battery. A
short circuit will damage the battery and could cause a fire resulting
in severe injury or death and property damage.
Keep the battery away from excessive heat and/or open flames.
Avoid long-term exposure to direct sunlight.
To avoid damage to the battery, never subject it to intense
physical shock or severe vibration.
Use of any battery not supplied with your A2B Kuo+ WILL void
the warranty and may cause damage to the electrical system and the
hub motor. Use only the battery supplied with your A2B Kuo+ or a
battery provided by A2B as a replacement for the battery supplied.
Failure to properly use, charge and store the battery supplied
with your A2B Kuo+ will void the warranty and may cause a
hazardous situation. Please read and follow all instructions for the
use and care of the battery provided with your A2B Kuo+. If you
are uncertain about any aspect of the use and care of your battery,
please contact your A2B dealer.
If you plan to store your A2B Kuo+ for more than 30 days
consult section 7.4.
7.2 Charging the battery
Use only the battery charger supplied with this battery. If you
use any other battery charger, you will void the warranty, you may
damage the battery and you could cause a fire that would result in
property damage and possible injury or death.
You may recharge the battery at any time, regardless of its state
of charge. As your battery ages, it will gradually lose capacity. With
proper care and maintenance, your battery will retain up to 80% of
its capacity over at least 500 discharge/recharge cycles. As
capacity diminishes, you will notice a gradual drop off in maximum
range capability.
7.0 Battery use, storage and disposal

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Owner`s manual
1. Check the Voltage on the charger to ensure that it is set to your
local line voltage (220-230V for Europe or 110V for the USA).
2. Plug the charger into the wall outlet.
3. Ensure that the battery power switch is switched OFF before
connecting the charger to the battery.
4. Locate the charger port cover. A
5. Carefully align the charger plug and
connect the charger to the battery
by plugging the connector into the
charger socket. B
6. Turn ON the charger using the ON/
OFF switch on the wall socket outlet.
To check the battery charge state
press the white button on top of the
battery. The charge indicator will
then highlight current charge status.
7. Charger LED Indications:
• The Power LED will illuminate
GREEN when the charger is plugged into a wall outlet when
switched on.
• The Indicator LED will illuminate RED while the charger is
charging the battery.
• The Indicator LED will change to GREEN when the battery is
fully charged.
8. When charging is complete (the Indicator LED is GREEN), turn
OFF the charger.
9. Carefully unplug the charger from the battery pack by pulling the
connector out of the charger socket.
10. Your battery is now ready for use.
Never pull the cord to unplug the power cable as this will
damage the cord and can result in a dangerous short circuit.
ALWAYS connect the charger to the power source, with the
charger turned OFF, before connecting the charger to the battery.
ALWAYS disconnect the charger from the battery, with the power
turned OFF, before disconnecting the charger from the power
source.
To avoid damage to the charger, never subject it to intense
physical shock or severe vibration.
Improper use of the battery charger can result in a fire with
property damage and physical injury or death.
DO NOT cover the charger while charging the battery. This can
cause the charger to overheat that may result in a fire with property
damage and physical injury or death.
The battery charger supplied with this bike is for INDOOR use
only.
Avoid any contact with water or other fluids whilst charging the
battery. If the battery, charger or any connections become wet,
immediately unplug the charger and thoroughly dry all components
prior to charging the battery.