Heartway Medical Products S19F User manual

S19F
User Manual
Version: 2021-01

Contents
Safety Instruction .……………………..…………………... P03
Product Specification……..……………………………….. P06
Adjustment ..…………………………………....….……… P07
Operation of Control ...………..…………………………… P09
Brake & Battery Connection ….…………………………. P21
Battery & Charging Instruction …………..………………. P11
Indicator Signal …………..…………………….…..……. P13
Maintenance & Repair ……………..………………...…... P24
………………………………………………….. P27
Warranty Declaration ..…………………………………... P28
…………….……..………...…………………... P01
Information
BOM List
Electromagnetic Interference .………...……………….. P21

All adjustments can be adjusted by both occupant and
assistant. This vehicle is suitable for land and/or air transport.
Please refer to our official website for general product
information at www.heartway.com.tw
Don’t operate your power scooter without completely reading and understanding
this user manual!
Do not operate the scooter with depleted batteries, since the occupant could be
stranded.
The end user is NOT allowed to change the parameter.
The occupant can switch off the key to stop the scooter for any emergency stop
please remove the battery package from the scooter unit before long term
storage.
Before taking the unit for a drive, to make sure the batteries are connected
before charging the unit to the fullest.
**Notice to the user and/or patient that any serious incident that has occurred in
relation to the device should be reported to the manufacturer and the competent
authority of the Member State in which the user and/or patient is established**
S19F should be turned off prior to entering or existing the seat. Make sure the
scooter is fully un‐folded before driving.
For detailed product safety notice and product recalls, please contact your local
authorized distributer direct. The recall notice should include the following
information: Product description, including the name, make, model and any
distinguishing features, batch, or serial numbers. The power scooter has
provision for an anterior pelvis support to be fitted such as belt
The power scooter has provision for an anterior pelvis support to be fitted such
as belt
WARNING
Electrically powered scooter Class A (EN 12184)
Heartway Medical Products. Co. Ltd. No 18th Jingke Central 1st Road
Nantun Dist. Taichung City 408, Taiwan ROC.
The users need to consult the instructions of the device for information
on how to .use it properly
Moving of adult disabled persons by self-driving. Maximum user weight: 115 kg
(254 Ibs); Classified in Class A (EN12184) Maximum safe slope: 3°
(Not intended for outdoor use).
The product is not intended for visually impaired people. The drivers need to
mentally and physically suitable to drive the scooters. The fingers need to work
functionally. The device can’t be used by children until age of 12. The driving
distance will be reduced if the power scooter is used frequently on slopes,
rough ground or to climb kerbs. The scooter is not for use as a seat in motor
vehicle.
01

Environmental conditions may affect the safety and performance of your power
scooter. Water and extreme temperatures are the main elements that can cause
damage and affect performance.
A) Rain, Sleet and Snow:
If exposed to water, your power scooter is susceptible to damage to electronic or
mechanical components.
Water can cause electronic malfunction or promote premature corrosion of
electrical components and frame.
B) Temperature:
Some of the parts of the power scooter are susceptible to change in temperature.
The controller can only operate in temperature that range between -4°F (-20°C) and
113°F(45°C)
At extreme low temperatures, the batteries may freeze, and your power scooter
may not be able to operate.
In extreme high temperatures, it may operate at slower speeds due to a safety
feature of the controller that prevents damage to the motors and other electrical
components.
WARNING 02

SAFETY SYMBOL
The following symbols are used in the scooter to identify warnings, mandatory
actions and prohibited actions. It is very important that you read and understand
them completely.
It is classified in category A according to EN 12184.
It is compact, maneuverable and not necessarily able to
overcome obstacles outdoors
For ambient conditions
Protection class II
Charger IPX0 "Protect from moisture" / Scooter IPX4 "Splashproof"
Does not meet the ISO 7176-19 standard and cannot be
used as a seat in a motor vehicle.
Labeling on the product.
Devices for decommissioning the drive system
Warning: Switch on the drive system again before
leaving a user unattended.
Read and follow the information in the instruction manual.
Caution. Observing notes and accompanying
documents
Scooter
Class A
03

SAFETY SYMBOL
Charge the batteries fully before use.
Remove the key from an unattended
scooter.
Year of manufacture see label on the
product.
Heartway Medical Products Co., Ltd.
No.18, Jingke Central 1st Rd., Nantun Dist.Taichung City
40852,Taiwan (R.O.C.)
Europäischer Bevollmächtigter / Authorized Representative
Emergo Europe Prinsessegracht 20 2514 AP The Hague
The Netherlands
The scooter S19F is designed for indoor use for adults with mobility restrictions.
It is classified in category A according to EN 12184. It is compact,
maneuverable and not necessarily able to overcome obstacles outdoors;
The maximum load is 115 kg.
Inability to walk or severe walking disability due to
• paralysis • Loss of limbs • extremity defect / deformity • joint
• joint damage (not on both arms) other diseases
A supply with a scooter (or also electric wheelchairs) is indicated when
the use of hand-driven wheelchairs is no longer possible due to the
disability, but the correct operation of an electric motor drive is still
possible.
CONTRAINDICATIONS
INDICATIONS
The supply of scooters is unsuitable for people:
• with severe balance problems • with reduced and insufficient eyesight
• with severe cognitive impairments
CONFORMITY
This mobility meets the requirements of EN 12184: 2014 and the
requirements for class I medical devices in accordance with Class I of
Regulation MDR 2017/745 annex VIII.
04

SAFETY INSTRUCTION
Never use electronic radio
transmitters such as
walkie-talkies, or cellular
phones.
Make sure that there are
no obstacles behind you
while reserving your scooter.
Do not make a sharp turn or
a sudden stop while riding
your scooter.
Do not rider your scooter
in traffic.
Do not attempt to climb curbs
greater than limitation show
on Technical Specification.
Do not leave your hands
and legs off the scooter
when driving.
Do not rider your scooter
during snow in order to avoid
accident on slippery road.
Do not allow unsupervised children to play near this
equipment while the batteries are charging.
General
Always use a seat belt
and keep your feet on
the scooter all the time.
Never operate the scooter
while you are under the
influence of alcohol.
05

PRODUCT SPECIFICATION
MODEL S19F - Auto Folding Scooter
WEIGHT CAPACITY 115kgs(254 Ibs)
SEAT: TYPE/SIZE 16"
DRIVE WHEEL PU 200mmx50mm(8"x2")
FRONT CASTER (WHEEL) PU 180mmx40mm(7"x1.6")
REAR CASTER (ANTI-TIPPER) YES
MAX SPEED 6 KM/H
BATTERY SPECIFICATIONS 11.5 AH Li-Polymer
BATTERY RANGE 15KM
CHARGER TYPE 2.5Amp, 110/240 Volt,
Li-ION Charger
CONTROLLER TYPE Dynamic 50Amp
MOTOR TYPE 180W
WEIGHT: W/ BATTERY 23.5KG (51.8Ibs)
WEIGHT: W/O BATTERY 21.3KG (46.96Ibs)
Battery (removable, the heaviest part) 1.7KG (3.75Ibs)
TURNING RADIUS 1110 mm
SUSPENSION None
LENGTH 860mm
WIDTH 465mm
HEIGHT 835mm
FOLDED SIZE 730mm x 465mm x 420mm
SEAT WIDTH 400mm
SEAT HEIGHT 370mm
SEAT DEPTH 320mm
BACK HEIGHT 220mm
WHEEL BASE 560mm
Obstacle Climbing 30 mm
Max Safe Slope 3 Degree
LIFE TIME 5 Year
06

ADJUSTMENT
Folding Out the Scooter
Position the scooter with rear wheels
and anti-tipper wheels on the ground
Insert the key into the ignition of the scooter
and switch the scooter on. The green button
(arrowed below) on the scooter should now
be illuminated. Press this for 3 seconds
then release the button and the scooter will
automatically fold out. Alternatively, press
the green button on the remote. (in case of
emergency, press the red button on the rear
of the scooter to stop the folding procedure,
If this happens , remove the hazard and
keep your finger on the green button until
the scooter is fully folded out.
Switch off the scooter using the key
and lift up the backrest (highlighted
in the diagram right)
Folding Up the Scooter
The user should vacate the scooter. Folding
down the backrest of the seat
(highlighted on the diagram below)
07

The red button (arrowed below) on the
scooter should now be illuminated. Press
this for 3 seconds then release the button
and the scooter will automatically fold up.
Alternatively, press the red button on the
remote. (If case of emergency, press the
green button on the rear of the scooter the
stop the folding procedure. If this happens,
remove the hazard and keep your finger on
the red button until the scooter is fully folded
up).
Switch the scooter off using
the ignition and remove the
key. Turn the stand-by on/off
switch(located next to the
charger port) to the off position
08
ADJUSTMENT

OPERATION OF CONTROL
The power scooter is simple to operate. However, we recommend that you read carefully
the following instructions to become familiarized with your new vehicle. Please do not
operate this power scooter if it is behaving abnormally or erratically.
The following operation can be carried out either by assistant or occupant .
A Word of Caution:
Before you turn the power on, always be aware of the environment that surrounds you
to select your desired speed. For indoor environments we recommend that you select
the slowest speed setting. For outdoor operation of this vehicle we recommend that
you select a speed that is comfortable for you to control it safely.
The following steps are required to operate your vehicle safely with the controller.
Button functions
1
2
3
4
1. Battery Indicator: When your scooter is switched on, the needle on the meter
will move across the scale from the left 'red' sector towards the 'green' sector,
indicating the state of charge in your batteries. As the power is used up in
your batteries, the needle will slowly towards the 'red' sector indicating the
state of charge at that precise time. When the needle is fully over to the right,
the batteries are fully charged. When the needle falls towards the red sector,
your batteries are losing power, but you will still have power to spare. When
the needle falls into the red sector, your batteries are low in power and need
to be recharged. It is wise to recharge your batteries when the needle enters
the red zone (see Batteries and Battery Charging section of this manual).
2. High/Low Speed Adjustment: This allows you to pre‐select your desired
speed. The adjuster is proportional to speed and can be set anywhere
between minimum and maximum. Turn the adjuster knob counter‐clockwise
to minimum for a very gentle operation, and clockwise towards maximum to
increase your speed.
3. Power ON/OFF Light: The light will turn on if you insert the key. The light
will turn off if you take out the key.
4. Horn button: Press this button to sound the horn.( Easy operation for left hand
or right hand)
B. KEY ON
Insert the key and rotate it
clockwise to power on the
scooter. To turn off the scooter
rotate the key anti clockwise.
09

DRIVING
A Controller ON/OFF Switch
Insert the key to power on the scooter (Remove the key to power off). Swing the finger
lever control forward or backward to control the driving direction of the scooter (The
finger lever control is located at both sides of the controller and the returning of the
finger lever control to its neutral position,(center), will reduce the speed and stop the
vehicle by automatically applying the electro‐magnetic brakes
Finger Lever Control/Maximum
Force Applied on Lever is 4N
B Speed Control
Turn the adjuster knob clockwise towards maximum to increase your speed, and
counter‐clockwise toward minimum to slow down your speed.
C Finger Lever Control
The finger lever control can also control the speed of your vehicle. The deeper you
press on the finger lever
(forward / backward), the faster the vehicle will go.
Notes:
After inserting the key into controller ON/OFF port, the light of power ON/OFF will
turn on for a few seconds during self‐checking process.
When the vehicle is in operation, the surface of the charger will become slightly
warm.
In case of emergency, let go of the finger lever control and the vehicle will come
to a stop.
DO NOT touch the rear shroud while driving. It may be hot.
Control Panel Display
The control panel display is a multifunction visual display. It can provide a lot of
information of the vehicle.
When the needle falls into the red sector, your batteries are low on power and need to
be recharged. It is wise to recharge your batteries when the needle enters the red zone.
The remaining battery needle only goes lower when using the battery, regardless the
battery voltage. The remaining battery meter needle goes higher only when recharging
battery in progress.
System will power off when the battery voltage is lower than 21.0V.
System will be automatically power‐off when the vehicle is not in use over 30 minutes.
You need to remove the key and insert the key to restart the scooter.
10

BATTERY & CHARGING INSTRUCTION
We recommend that you use deep-cycle batteries that are sealed and
maintenance free for your power scooter.
General product Information:
The equipment is a Rechargeable Li-ion Battery Pack for use in the scope of
information technology equipment.
Model: EBP28A076C1
Cell’s arrangement: 7S4P
Minimum capacity (Ah): 11.5
Nominal voltage (Vdc) 25.2
Maximum charge current (A): 6.0
Maximum charge voltage (Vdc): 29.4
Maximum discharging current (A) 20.0
Discharge Cutoff voltage (Vdc): 19.6
Additional Information:
The battery cell used in the product is a certified product which was investigated
according to the standard of same version.
Other Comments:
The mass of equipment: Approx. 1.762kg/3.9Ibs
Remove the battery box from the power scooter
A) Please lift the side cover
B) Lift the battery box (1.7KG)
after removing the side cover
Make sure the battery connectors
are connected properly after you
install the batteries into the power
scooter.
11

CHARGING INSTRUCTIONS
BATTERY CHARGER
The battery charger takes the standard wall outlet voltage (alternating current) and
converts it into DC voltage (direct current).The batteries use direct current to run your
power scooter. When the batteries are fully charged, the amperage from the charger
is almost at zero. This is how the charger maintains a charge but does not
overcharge the battery.
Note 1: The batteries cannot be charged if they were discharged to nearly zero voltage.
Note 2: The power scooter meet the requirement of ISO 7176‐14:2008 and ISO
7176‐21:2003.
Note 3: Only use the battery charger type which was provided by the supplier.
The use of any different type of charger can be hazardous and need the approval of the
manufacturer.
Electrical Specifications:
1. Input : 100~240VAC, 50/60 Hz Output: 29.05V±0.2V 2.5Adc ±10%
2. Charger output：The charger is preset by factory for charging 7 cells Li-ion battery
pack.
Its charging mode:
1) Constant current (CC) mode: at beginning of charging, an 2.5Adc±10% (I (ave) )
constant charging current to charge the pack until the pack voltage reaches to
29.05V±0.2V.
2) Constant Voltage (CV) mode: the output will keep 29.05V±0.2V constant through
the end of charging.
3) Pre-charge state: When battery voltage is lower than 21V±1V, will start the pre-
charge first. The charge current is 30% of CC charge current: 0.75Adc ±10%.
12
This is charger port
ON/OFF SWITCH
Make sure the charger is not connected to the scooter and they key is not in the
ignition switch and to ensure connect the batteries. Then turn the on/off switch to the “ I
“ position to be abled to pass power to the scooter. Then you will see the two lights in
the rear will lit up. Then press the green button in the rear of the scooter to unfold.
Turn off the side button to “O”. Once unfolded, insert the key in the ignition key to be
able to drive.
DESCRIPTIO
NL07C-25HT is a smart charger specially designed for Li-ion battery pack composed
7cells in series.

Mechanical Specification:
1. Dimension: 167*74*37 mm.
2. Weight: 410g approx.
3. Charger output: 3‐pin connector. (Pin 1‐Positive ; Pin 2‐Negative ; Pin 3‐
Negative )
4. AC socket: Standard 2‐p oblong.
5. AC cable: National wall plug type upon request.
Operation procedures:
1. Attention! Connect charger first to AC power *before* connecting the battery to
the charger. Plug into AC mains the “power on” indicator will be on and the
“Status” indicator will be GREEN, then connecting the battery pack to charger.
2. If short circuit at output is found, the “Status” indicator will flash between RED
(16ms) and GREEN (496ms).The flash will be there until the system is reset
and the short part is removed.
3. During charging, the “Status” indicator turns on RED. When full, it turns on
GREEN.
4. To avoid the case of failed battery pack, when the charger stays in pre‐charge
stage longer than 5 hours, it will stop charging and the “Status” indicator will be
pulsed with a one second to indicate pre‐charge error.
INDICATOR SIGNAL
The Indicator Signal Chart
Indicator
Condition LED 1 LED 2
Power On
(Power on by plugging in AC source and
without battery)
Flashing in three times then ON
OFF ON
Constant Current Mode ON OFF
Constant Current Mode ON OFF
Battery Fully Charged
(Terminate Current ≤300 ± 100mA) ON ON
Pre-Charged Mode Slow Flash OFF
Pre-Charged Mode Fail Red and Green LEDs
Flash synchronous
Over Voltage, Over Current, CC CV
Mode Current Fail
Red and Green LEDs Quickly Flash
alternately
13

5. During charging, user can remove the battery from charger any time as
he/she wants. Users also could start to charge the battery at any time. The
charger is able to determine the best cut‐in point where the charging
process is starting to.
6. In case of problems, please check battery pack and repeat above steps. If
problem persist, please contact manufacturer for assistance.
Check before Proceeding:
1. Make sure battery pack is compatible with NL07C before connecting.
2. The 3‐pin connector of the output cable is pre‐set at the factory. Do not
swap their connections which may cause serious hazards.
3. NL07C charger is designed for use only with lithium battery packs and is
not recommended for use with other battery packs.
4. NL07C is a precise tool and should be kept away from high power EMI
radiating devices.
14

1. Don’t operate scooter on public streets and roadways. Be aware that it may be
difficult for traffic to see you when you are seated on the scooter. Obey all local
pedestrian traffic rules. Wait until your path is clear of traffic, and then proceed
with extreme cautions.
2. To prevent injury to yourself or others, always ensure that the power is
switched off when getting on or off of the scooter.
3. Always check that the drive wheels are engaged (drive mode) before driving.
Do not switch off the power when the scooter is still moving forward. This will
bring the chair to an extremely abrupt stop.
4. Do not use this product or any available optional equipment without first
completely reading and understanding these instructions. If you are unable to
understand the warnings, cautions or instructions, contact a healthcare
professional, the dealers or technical supports before attempting to use this
equipment, otherwise, injury or damage may occur.
5. There are certain situations, including some medical conditions, where the
scooter user will need to practice operating the scooter in the presence of a
trained attendant. A trained attendant can be defined as a family member or
care professional especially trained in assisting a scooter user in various daily
living activities. Consult with your physician if you are taking any medication
that may affect your ability to operate your scooter safely.
6. Do not attempt to lift or move a power scooter by any of its removable parts
including the armrests, seats or shrouds. Personal injury and damage to the
power chair may result.
7. Never try to use your scooter beyond its limitations as described in this manual.
8. Please do not sit on your scooter while it is in a moving vehicle.
9. Keep your hands away from the wheels (tires) while driving scooters. Be aware
that loose fitting clothing can become caught in the drive tires.
10. Consult your physician if you are taking prescribed medication or if you have
any certain physical limitations. Some medications and limitations may impair
your ability to operate scooters in a safe manner.
11. Be aware when the drive mode is unlocked or locked.
12. Don’t remove anti-tipper if there is any-tipper equipped with the scooter.
13. Contact with tools can cause electrical shock and do not connect an extension
cord to the AC/DC converter or the battery charger.
14. Do not attempt to lift or move your scooter by any of its removal parts, such as
the armrests, seats, or shroud.
15. When climbing an incline, don’t drive at an angle up the face of the incline.
Drive your scooter straight up the incline. This greatly reduces the possibility of
a tip or a fall.
16. Don’t climb a slope steeper than the scooter’s limitation.
17. Don’t attempt to have your scooter proceed backward down any step, curb or
other obstacle. This may cause the scooter to fall or tip.
18. Always reduce your speed and maintain a stable center of gravity when
cornering sharply. Don’t corner sharply when driving scooters at higher speeds.
WARNING 15

19. Operating in rain, snow, salt, mist conditions and on icy or slippery surfaces
may have an adverse affect on the electrical system.
20. Never sit on your scooter when it is being used in connection with any type of
lift or elevation product. Your scooter is not designed with such use in mind and
any damage or injury incurred from such use is not the responsibility of
Heartway.
21. Surfaces of the power scooter that can come into direct contact with the
occupant’s skin and/or assistant’s skin during normal use and that are within
occupant reach shall not exceed 105.8 °F(41 °C). The motor surface can reach
temperatures greater than 105.8 °F(41 °C) after driving. Do not touch these
parts when disassembling the scooter or wait until the motor is cooled down.
22. The programming of the controller shall only be carried out by personnel, which
is authorized by his manufacturer. A wrong programming can result in safety
hazards for the occupant!
23. Drive-wheel needs to be switched to engaged-mode while transporting the
power scooter with a car or airplane.
24. Surface temperatures can increase when exposed to external sources of heat.
Heartway Medical Product has designed and engineered power scooter to provide
maximum utility. However, under no circumstances should you modify, add, remove,
or disable any part or function of your power scooter. Personal injury and damage to
the power scooter may result.
1. Do not modify your power scooter in any way not authorized by Heartway. Do
not use accessories if they have not been tested or approved for Heartway
products. Changing of controller parameter shall be only performed by
authorized technicians due to the safety concern.
2. Get to know the feel of your power scooter and its capabilities. Heartway
recommends that you perform a safety check before each use to make sure
your power scooter operates safely.
IMPORTANT NOTICE
Inspections prior to using your power scooter:
1. If equipped with pneumatic tires, please check for proper tire inflations.
2. Please check all electrical connections and make sure they are tight and not
corroded.
3. Please check all harness connections and make sure they are secured properly.
4. Please check the brakes.
16

Weight limitation.
1. Please refer to the specifications table for weight capacity information. Power
scooter is rated for a maximum weight capacity.
2. Stay within the specified weight capacity for your scooter. Exceeding the
weight capacity voids your warranty.
3. Heartway will not be held responsible for injuries or property damage
resulting from failure to observe weight limitations.
4. Don’t carry passengers on scooters.
5. Carrying passengers on scooter may affect the center of gravity, resulting in a
tip or a fall.
Tire inflation
1. If your scooter is equipped with pneumatic tires, it is necessary to check the air
pressure at least one time a week.
2. Proper inflation pressures will prolong the life your tires and ensure the smooth
operation while riding.
3. Inflating your tires from an unregulated air source could over‐inflate them,
resulting in a burs tire.
Temperature
1. Some of the parts of the power scooter are susceptible to change in
temperature. The controller can only operate in temperature that ranges
between -4°F ~ 113°F (-20°C ~ 45°C).
2. At extreme low temperatures, the batteries may freeze, and your power scooter
may not be able to operate. In extreme high temperatures, it may operate at
slower speeds due to a safety feature of the controller that prevents damage to
the motors and other electrical components.
3. The scooter can generally be operated at outside temperatures from -14°F to
+113°F.(-10°Cto+45°C)
4. Some parts of the scooter tend to be temperature dependent. The controller
works best at temperatures between 77°F and 113°F (25°C and 45°C)
5. Below 5°F(-15°C) the batteries can freeze and the scooter may not work.
6. At extremely high temperatures > 113°F(45°C), the safety function of the control,
which prevents damage to the motors and other electrical components, can
lead to slower maximum speeds.
17

ELECTROMAGNETIC INTERFERENCE (EMI)
The rapid development of electronics, especially in the area of communications, has
saturated our environment with electromagnetic (EM) radio waves that are emitted by
television, radio and communication signals. These EM wave are invisible and their
strength increases as one approach the source. All electrical conductors act as
antennas to the EM signals and, to varying degrees, all power scooters and scooters
are susceptible to electromagnetic interference (EMI). The interference could result in
abnormal, unintentional movement and/or erratic control of the vehicle. The United
States Food and drug Administration (FDA) suggests that the following statement be
incorporated to the user’s manual for all power scooter like the S19F. Power scooters
may as susceptible to electromagnetic interference (EMI), which is interfering
electromagnetic energy emitted from sources such as radio stations, TV stations,
amateur radio (HAN) transmitter, two‐way radios, cellular phones and alarm systems
of shops. The interference (from radio wave sources) can cause the power scooter to
release its brakes, move by itself or move in unintended directions. It can also
permanently damage the powered scooter’s control system. The intensity of the EM
energy can be measured in volts per meter (V/m).Each powered scooter can resist
EMI up to a certain intensity. This is called “ immunity level”. The higher the immunity
level the greater the protection. At this time, current technology is capable of providing
at least 20 V/m of immunity level, which would provide useful protection against
common sources of radiated EMI.
Following the warnings listed below should reduce the chance of unintended brake
release or powered scooter movement that could result in serious injury:
1. Do not turn on hand‐held personal communication devices such as citizens band
(CB) radios and cellular phones while the powered scooter is turned on.
2. Be aware of nearby transmitters such as radio or TV stations and try to avoid
coming close to them.
3. If unintended movement or brake release occurs, turn the powered scooter off as
soon as it is safe.
4. Be aware that adding accessories or components, or modifying the powered
scooter, may make it more susceptible to interference from radio wave sources
(Note: It is difficult to evaluate the effect on the overall immunity of the powered
scooter).
5. Report all incidents of unintended movement or brake release to the powered
scooter manufacturer, and note whether there is a radio wave source nearby.
TURN OFF YOUR POWERED SCOOTER AS SOON AS POSSIBLE WHEN
EXPERIENCING THE FOLLOWING:
Unintentional scooter movements.
Unintended or uncontrollable direction.
Unexpected brake release.
18