COOLER KING Cooler Kub 250S 2024 User manual

Cooler Kub - Owners Manual
February 2024

If you’re reading this, you’re probably just unpacking your brand new
Cooler Kub electric bike.
Lots of people don’t bother with manuals, make mistakes and then
contact us to ask why the thing they skipped in the manual is happening.
Thank you for reading, we’re glad you’re not one of them xx
If you require support after reading this manual please email our expert
support team at car[email protected]
If you feel there’s something you’d like to add to your Cooler Kub, check
out these essentials.
Now the fun starts…
Open the box and take out your Cooler Kub carefully.
The package has following items:
BIKE
CHARGER
PEDALS
BATTERY
Remove all zip ties and packing material. Be careful when it comes to the
edge of the frame, tyres and rims.
Now follow steps to assemble your Cooler Kub, or skip ahead to Page 5 if
you’ve already put it together.

Install The Handlebars
Make sure the handlebar bracket is turned outwards, so the opening is
facing frontwards if it is not already. The two screws on each side of the
bracket can be loosened before and tightened after turning it.
To install the handlebars, loosen the screws to put the handlebar in
between the bracket and the clasp. Add the handlebars and replace the
clasp.
Adjust handlebar angle and fasten the 4 screws one by one with a 4mm
Allan key to 20N.M.
Later you may wish to adjust the rake for comfort, but for now, just fit
them securely. Be careful not to pitch them too low so that they hit the
tank battery cover.

Install the Pedals
Use the pedal marked with an “L” on the left side and the right pedal
marked with an “R” on the right side (side with drivetrain gears).
The right-side pedal has a right-hand thread (removes counterclockwise,
installs clockwise); the left side pedal has a left-hand
thread (removes clockwise, installs counterclockwise).
Be careful to not cross thread the pedals.
Tyre Pressure
Your tyres have the Max Pressure stamped on them. Keep below the Max
Pressure, up to 90% is a good rule of thumb. So if your tyre says 'Max
Pressure 30PSI, try 27PSI and see how it feels to ride.
Be careful when pumping your tyres that the tyre edge remains beneath
the rim. You can rotate or squeeze it into place as you inflate, or keep it off
the ground.
If you need a pump, check our website for something suitable.

Opening The Tank
To open the tank and get to the top battery, reach underneath and twist
the turnscrew anti clockwise (or clockwise as you're looking down on it -
if that helps!).
Turn the handlebars to one side, push the tank rearwards and carefully lift
the front of the tank upwards to remove it.
Do the opposite to reinstall.
There is a small extension cable on the right hand side, pointing forwards
if you prefer to leave the tank battery cover on and charge the upper
battery in situ.

Charge Battery before Your First Ride
Switch your battery off and plug the charger lead into the battery socket.
Your intelligent battery charger has an indicator and a red light means that
the battery is charging. It will turn to green when it’s finished charging.
You can leave it on unattended, it won’t overcharge.
The battery has LED indicator lights to show what state of charge it is in.
Switch the battery on and push the button to test it.
Keys
Each battery comes with a numbered set of keys. Make sure your battery
is securely locked on to the cradle before setting off, or it could fall off and
damage the battery and the cradle.
Batteries and Chargers
If you require an additional or replacement battery or charger, please
choose the correct one for your Cooler Kub.
Cooler Kub 250S Chargers and Batteries
Cooler Kub 750S Chargers and Batteries

Some Battery Tips
●Lithium battery capacity drops down over time.
●Samsung battery cells provide 600~800 charging cycles.
●Stay away from extreme environments. The most suitable
temperature for the battery is -10°C~45°C. Do not approach heat, fire,
or fierce zombies and try to prevent the battery from being dropped
or getting wet. Do not insert metal into the battery. Ever.
●The battery indicator bar on the LCD display can sometimes be a bit
flakey on ebikes. If you are not getting an accurate indication, try to
totally run down the battery then charge it to full. The Battery
Management System will reset the indicator.
●Just like a car, frequent accelerating and braking will drain your
battery faster and give less range than taking it easy. You probably
already knew that.
●8 hours of non-use still consumes around 5% of battery capacity to
support the battery management system. If you don't use the battery
for a long time, give it longer than usual to recharge again.
●If you can, try not to not use the battery when it has less than 10%
capacity left. Charge it when you can, to prolong the battery life.
●Your Cooler Kub is waterproof but don’t take it swimming please. It’s
splash proof for sure, but it’s not a diver’s watch.
●If your battery hasn’t charged to full after more than 12 hrs on
charge, stop charging contact [email protected]

The Top Secret Master Switches
At the rear of your Kub, under the seat are two electric isolator switches.
One (Red) is to enable the battery that lives in the fuel tank, the other
(Blue) is for the lower frame battery.
If both switches are off, there’ll be no power to your bike. So, choose the
correct switch for the battery you want to use and switch it to the other
when you swap.
Both switches can’t be on, but both can be off.
Make sure to switch it on before your ride, and off after your ride. It helps
protect the battery from draining itself and turns all the lights off.
(You can also use this switch on the sly when someone asks for a ride
that you don’t want to lend it to. Flick the switch and tell them, “Sorry, it’s
out of power”)

Headlight Control
On the handle bar, there are two switches for the headlight.
The headlights have a three way function for the LED daytime running
light, low beam and full beam. Use your Daytime Running Light (DRL) light
in daytime please. It’s safer and because it’s LED, hardly uses any power.
Light Master Control
Headlights, DRL and Rear Lights can all be turned on and off using the
large button beneath the indicator switch.
Rear Indicators
On the headlight switch panel is the switch for the rear indicators. Flick it
left or right, depending where you’re heading and off after you’re turned.
Rear Light and Brake Light
The rear LED light is on as long as there is power coming from the battery
and the Light Master Switch is on. If you hit the display ON/OFF it will
change the rear light from static to flashing.
The brake light automatically flashes when the brake is applied.

Thumb Throttle
The thumb throttle is beside the handlebar grip.
Beneath the throttle itself is an On / Off switch. This disables the throttle
for when you might need to. If your Kub is not reacting to the throttle, it’s
most likely the switch is turned off.
If your screen is powered up but there’s no response from the throttle, it’s
most likely that the throttle switch is off.
*Some countries do not allow riding with a thumb throttle on the road, so
check your local laws to see whether the thumb throttle can be used.

Display and Control Keypad
To fire up your Cooler Kub hold the power switch on the left handlebar.
Repeat this action to switch it off.
Your Kub runs in three different mode settings. POW, ECO and LGL.
LGL limits your speed to 25km/h, limits the power supply to the motor to
give a max power of 250w and limits the thumb throttle so that your bike
is purely pedal assisted. (Your bike may be stickered already to represent
this limited restricted power setting).
POW is all the power unleashed. It’s full on, you don’t need to hack it. (It’s
not road legal in some parts of the world, so please check local laws).
To switch mode between LGL to POW, stay on the Home Screen, hold
the key for three seconds and release. Repeat to access ECO or
LGL again.
To switch between MPH and KM/H settings:
1. Press SET for 3 seconds to enter Settings
2. Password: 0118
3. Navigate to Units
4. Select MPH or KMH

5. Press SET to highlight the unit, then + to choose your preferred unit,
SET, save and exit.
6. MENU page press: 4. Save Exit
Pedal Assist Setting
Press + or – to adjust PAS speed level.
There are 5 PAS levels by default. Each level adjusts the rate of power
and violence that the motor kicks as you peddle.
For your first ride, we suggest PAS Level 1 and working up.
PAS 5 can be brutal if you’re unprepared.
For more technical detail on the display, the manufacturers manual is
here.
Home Maintenance
You should ensure the nuts on the bike are regularly checked for
tightness. Start at the front wheel and handlebars.
Servicing
Every 12 months or 1500 miles / 2500 kms have your local bike shop
service the bike, checking the brakes, gears, crank and lubrication points.
The electrical parts need no servicing.
Troubleshooting
If you have trouble setting off, please make sure all of the following are
ready:
Battery charged, securely fastened and locked on.
Battery switched on.
Secret Isolator Switch under the seat is on.
Screen is switched on.
Thumb throttle switch is on.

If there are errors occuring, an error code will appear automatically. (We
hope you won’t need this bit and recommend that an experienced
technician carries out any changes ).
Error Code
Definition
Solution
1
Current error or MOS damaged
Replace controller
2
Throttle Abnormality
Disconnect throttle
wire (located in the
controller box, or in
front of the
handlebar if the bike
has a waterproof
quick release
connector) to see
whether the ERROR
code disappears. If
it disappears,
replace the throttle.
3
Motor Abnormality
Re-connect motor
wire (located
underneath chain
stay at right side). If
it still doesn’t work,
replace the motor.
4
Motor Hall Abnormality
Turn off and on
again (really!) If this
doesn’t work,
contact Cooler King
as you may have to
return the rear wheel
to replace a motor
rotor.
5
Brake Abnormality
Disconnect 2 brake
lever wires (located
in front of the
handlebars to see
whether the ERROR
code disappears. If
it does, replace the
brake lever and

reconnect brake
lever wire to the
controller.
6
Under voltage
Fully charge the
battery
7
Motor stalling
Do not block the
motor from rotating
freely
8
Communication controller
receiving error
Disconnect all wires
(brake lever, display,
throttle, and motor)
then reconnect.
Check all
connectors are in
good condition.
9
Communication display
receiving error
CK Ebikes Ltd., London
Phone UK: [phone] / US [phone]
Instagram @cooler__king #coolerkub
Support Team: [email protected]
Sales Team: [e-mail]
WhatsApp [phone]
Parts: cooler.bike/collections/parts
Accessories: cooler.bike/collections/cooler-king-accessories