AirSep MN126-1 C User Manual

FreeStyle

™

Portable

Oxygen Concentrat

or

Service Manual

AirSep

Corporation • 401 Creekside

Drive

• Buffalo, NY

14228-2085 USA

T

elephone:

716.691.0202 • 24-Hour

Fax:

716.691.4141 • www

.airsep.com

Expedited Product Warranty Check service is always at your fingertips with AirS

ep:

http://www.airsep.com/Support/Warranty_Information.aspx

OR

In the

US

or Canada,

dial

866-873-9277

Air Travel with FreeStyle

FreeStyle is approved for use on-board commercial aircraft per an addendum to FAA SFAR

106.

A

irS

ep

®

is a registered trademark of

AirSep Cor

pora

tion.

!

FreeStyle™

is a trademark of

AirSep Cor

pora

tion.

MN126-1 Rev. C 02/14

Table of Contents

Section 1.0

Intr

oduc

tion

Section 2.0

Operation Check

and

1.1 Equipment Provider Responsibility 1-1

1.2

I

mpor

tant Notice and Symbol Explanations 1-2

1.3 Definitions of Symbols 1-3

1.4 FreeStyle Specifications 1-4

1.5 FreeStyle Classifications 1-5

T

est

of Oxygen Concentration

2.1

Description of

Operation

2-1

2.2

Operation Check

2-1

2.3

Alarm Sy

stem

2-2

2.3.1

S

tart-up 2-2

2.3.2

Battery Sta

tus

2-2

2.3.3

Low Batter

y

2-2

2.3.4

Discharged Battery

2-2

2.3.5

Battery Charging

2-3

2.3.6

Battery

Fully Char

ged

2-4

2.3.7

Cannula

Disc

onnec

t

2-4

2.3.8

Performance War

ning

2-4

2.3.9

FreeStyle Capacity Exc

eeded

2-4

2.3.10

General Malfunc

tion

2-4

Section 3.0

Patient Instructions

2.4 Oxygen Concentration T

est

and Specification 2-5

3.1 General Instructions

3-1

3.1.1 Connecting to External Power 3-1

3.1.2 Optional

AirBelt

Battery 3-1

3.2

R

outine

Maintenance by the Patient 3-4

AirSep Corporation i – table of contents

Section 4.0

E

quipment Provider

M

aintenance

3.2.1 Cleaning the

Air In

take

Gross Particle Filter 3-4

3.2.2 Alarm/Service

I

ndicator

3-5

3.2.3 Nasal Cannula 3-5

3.2.4 Usage During Sleep 3-5

4.1 No Scheduled Maintenance 4-1

4.1.1

Air In

take

/ Gross Particle Filter

4-1

4.1.2 Product Filter Replac

emen

t

4-1

4.1.3 Compressor Servicing

4-2

4.1.4 Recording M

aintenanc

e

4-2

4.2

Infection Contr

ol

4-2

4.3

Cleaning and Preparing for New Patient Use

4-2

Section 5.0

Service

5.1

C

omponen

ts

5-1

5.2

Housing Removal

5-2

5.2.1 Remo

ving

Front Cover

5-2

5.2.2 Remo

ving Back

Cover

5-2

5.3

Internal

Battery Replac

emen

t

5-3

5.4

PSA Removal

5-4

5.5

Compressor Replac

emen

t

5-10

5.5.1 Compressor Assembly Removal

5-10

5.5.2 Compressor Assembly Installa

tion

5-12

5.6

Product Manifold Replac

emen

t

5-13

5.7

Solenoid Valve Replac

emen

t

5-14

5.8

Adsorbent Bed R

eplac

emen

t

5-15 5.9

Feed/Waste Manifold Replac

emen

t

5-17

5.10

Measuring System Pr

essur

e

5-18

5.11

Hour Meter Func

tionalit

y

5-19

5.11.1 Icons

5-19

5.11.2 Power

5-19

5.11.3 Service

LED

5-19

5.11.4 Toggle/R

eset S

wit

ch

5-20

5.12

Hour Meter Replac

emen

t

5-20

ii – table of contents AirSep Corporation

iii – table of contents

AirSep Corporation

iii – table of contents

5.13

Circuit Board Replac

ement 5-21

5.14 Motor Controller

B

oard Replac

ement 5-25

5.15 Control/Key Panel

R

eplac

ement 5-27

5.16 Fan

R

eplac

ement 5-31

Section 6.0

Typical

Pressure Profiles

6.1 Pressure

Profile

Quadrant 6-1

Section 7.0

Troubleshooting

7.1 General Tr

oubleshooting

7-1

7.2 Tr

oubleshooting

Chart 7-2

Section 8.0

Recommended Tools

8.1

Tools

for FreeStyle Service and Maintenance 8-1

A

ppendix

Exploded Dra

wings

Figure

1:

FreeStyle — Inter

nal

Front View

A-1

Figure

2:

FreeStyle — Inter

nal R

ear V

iew

A-2

Figure

3:

FreeStyle —

PSA

Assembly - Pr

oduct

Manifold A-3

Figure

4:

FreeStyle —

PSA

Assembly - Feed/W

aste

Manifold A-4

AirSep Corp. — FreeStyle Service Manual

1.0 Introduction

1.1 Equipment Provider Responsibility

All Equipment Providers of the FreeStyle™ Portable Oxygen

Concentrator

must

assume

responsibilities

for handling, operational check-out, patient instruction, and

maintenance.

These

responsibilities

are outlined below and throughout this manual.

!

This unit is not to be used for life support. Geriatric, pediatric, or any other patients unable
to communicate discomfort while using this unit may require additional monitoring. Patients
with hearing and/or sight impairment(s) may need assistance with monitoring alarms.

As an Equipment Provider, you must do all of the following:

■ Inspect the condition of each FreeStyle unit immediately upon
delivery to your business location. Note any sign of damage,
external or internal, on the delivery receipt, and report it
directly to both the freight company and AirSep Corporation
immediately.

■ Check the operation of each FreeStyle unit before delivery to a
patient. Always operate the unit for a minimum of 10 minutes,
and check that the oxygen concentration level is within
specifications, as described in Section 5 of this manual.

■ Deliver FreeStyle units only to patients authorized by a physician’s
prescription. FreeStyle must not be used as a life-supporting

device.

■ Instruct patients how to use FreeStyle in conjunction with the
Patient Manual.

■ Instruct patients to notify their physicians and/or Equipment
Providers if they experience any signs of discomfort.

■ Instruct each patient to perform routine maintenance of the air intake gross
Filter. (Refer to Section 3.2.)

■ Be available to service each patient at any time.

■ Maintain FreeStyle in accordance with Section 4.0.

■ Repair components and replace parts only as outlined in this

manual. Use only AirSep parts for replacement in FreeStyle Oxygen
Concentrators.

AirSep Corp. — FreeStyle Service Manual

1-2

1.2 Important Notice and Symbol Explanations

As you review both the FreeStyle Patient Manual and this FreeStyle Service
Manual, pay special attention to the WARNING, CAUTION, and NOTE messages.
They identify safety guidelines or other important information as follows:

DO NOT OPERATE THIS EQUIPMENT WITHOUT FIRST READING AND UNDERSTANDING THIS
MANUAL. IF YOU ARE UNABLE TO UNDERSTAND THE WARNINGS AND INSTRUCTIONS,
CONTACT YOUR EQUIPMENT PROVIDER BEFORE ATTEMPTING TO USE THIS EQUIPMENT;
OTHERWISE, INJURY OR DAMAGE MAY RESULT.

Smoking while using oxygen is the number one cause of fire injuries and
related deaths. You must follow these safety warnings:

Do not allow smoking, candles, or open flames in the same room with the device or
within 5 feet (1.52 meters) of the oxygen-carrying accessories.

Smoking while wearing an oxygen cannula may cause facial burns and possibly death.

Removing the cannula and putting it on bedding, sofas, or other cushion material will
cause a flash fire when exposed to a cigarette, heat source, or flame.

If you smoke, these 3 steps may save your life:
turn off the oxygen concentrator, take off the cannula, and leave the room where this
device is located.

Warning – Describes a hazard or unsafe practice that if not avoided can result in severe

bodily injury, death or property damage

Caution – Describes a hazard or unsafe practice that if not avoided can result in minor

bodily injury or property damage

Note – Provides information important enough to emphasize or repeat

“No Smoking – Oxygen in Use” signs must be prominently displayed in the home, or
where the oxygen concentrator is in use. Patients and their caregivers must be informed
about the dangers of smoking in the presence of, or while using, medical oxygen.

AirSep Corp. — FreeStyle Service Manual

1.3 Definitions of Symbols

Symbols are frequently used on equipment and/or the manual in preference to words
with the intention of decreasing the possibility of misunderstanding caused by
language differences. Symbols can also permit easier comprehension of a concept
within a restricted space.

The following table is a list of symbols and definitions used with the FreeStyle
Portable Oxygen Concentrator.

RTCA DO160 Section 21
Category M Compliant. FAA
SFAR 106 requirement

Safety agency for CAN/CSA C22.2 No.

601.1 M90 for medical electrical
equipment

Symbol

Description

Symbol Description

ON (power switch on)
OFF (power switch off)

Warning – Describes a hazard or unsafe

practice that if not avoided can result in
severe bodily injury, death or property
damage

Class II Equipment, double insulated

Caution – Describes a hazard or unsafe

practice that if not avoided can result in
minor bodily injury or property damage

Complies with the 93/42/EEC directive
drawn up by the approved organization
No. 0459

Note – Provides information important
enough to emphasize or repeat

Safety agency for CAN/CSA C22.2 No.

601.1 M90 for medical electrical
equipment

Consult the accompanying
documents

Keep unit and accessories dry

Use no oil or grease

Proper disposal of waste of electrical and
electronic equipment required

No smoking

Do not disassemble

Type BF equipment

Consult instructions for use

Oxygen outlet connection to the
cannula

Do not expose to open flames

Caution: Federal law (USA) restricts
this for sale or rental by or on the order
of a physician or licensed health care
provider.

Do not block fan

AirSep Corp. — FreeStyle Service Manual

1-4

1.4 FreeStyle Specifications

Max Operational
Altitude:

up to 12,000 ft (3,657.6 m) (483mmHg) Higher altitudes may affect
performance

* Based on an atmospheric pressure of 14.7 psia (101 kPa) at 70

o

F (21oC)

* Operating unit outside of normal operational temperature range can affect performance.

Oxygen Concentration:*

1-3 pulse settings; equivalent to a continuous flow of
90% +5.5/-3% Oxygen Concentration

Dimensions:

8.6 in. high x 6.1 in. wide x 3.6 in. deep
(21.8 cm high x 15.5 cm wide x 9.1 cm deep)

Weight:

4.4 lb (2.0 kg); 1.8 lb (.8 kg) optional Airbelt

Universal Power Supply:

AC Power Supply: 100 – 240 VAC (1.0 amp at 120 VAC)

DC Power Supply: 11-16 VDC (6.0 amps max. at 13.5 VDC
nominal)
FreeStyle unit: 28 W nominal at 3 setting

Battery duration:

3 setting - 2 hours; 2 setting - 2.5 hours; 1 setting - 3.5 hours

Optional AirBelt when combined with the internal battery:

3 setting - 5 hours; 2 setting - 6 hours; 1 setting -10 hours

Battery charge time:

3.5 hours; optional AirBelt: 3 hours

Warm-up time:

2 minutes

Battery cycle life:

Approximately 300 cycles, then 80% capacity or below

Audible alarms and

pulse visual indicators:

Start-up – audible and visual (GREEN indicator light); Pulse

flow – visual (GREEN light); Battery condition – battery

level (GREEN indicator lights); Cannula disconnect- audible

and visual (RED alarm light); System overdraw –

audible and visual (RED warning and alarm lights); High and

low pressure – audible and visual (RED alarm light);

Service required: visual (YELLOW alarm light)

Sound:

38 dBA at 1 Setting: 41 dBA at 2 setting: 44 dBA at 3 setting

Temperature range
intended for use:

Operational temperature: 41oF to 104oF (5oC to 40oC)
Storage temperature: -4

o

F to 140oF (-20oC to 60oC)

AirSep Corp. — FreeStyle Service Manual

1.5 FreeStyle Classifications

Classification

Type of protection against electric shock:

Class II Protection from electric shock is achieved by double insulation.

Degree of protection against electric shock:

Type BF Equipment providing a particular degree of protection against electric shock regarding

1) allowable leakage current;

2) reliability of protective earth connection (if present).
Not intended for direct cardiac application.

Independent testing for Medical Electrical Equipment Standard.

Tested to be in compliance with:

IEC 60601-1 Medical Electrical Equipment – Part 1: General Requirements for Safety

Tested to be in compliance with applicable requirements of the Standard,
CAN/CSA C22.2 No. 601.1-M90 Medical Electrical Equipment – Part 1: General
Requirements for Safety

Protection against potential electromagnetic or other interference between the equipment and other
devices:

Device with accessories tested to be in compliance with

EN 60601-1-2 Medical Electrical Equipment, Part 1: General Requirements for Safety-Collateral
Standard: Electrical Compatibility - Requirements and Tests
RTCA / DO160 Airborne Equipment, Sec. 21, Emission of Radio Frequency Energy
CISPR 11 / EN 55011, Class B Group 1, “Industrial, Scientific, and Medical (ISM) Equipment”
FCC Part 15, Subpart B – Class B Unintentional Radiators

Method of cleaning and infection control allowed:

Please refer to the “Cleaning, Care, and Proper Maintenance” section of this FreeStyle
Service Manual.

Degree of safety of application in the presence of flammable anesthetic gases:

Equipment not suitable for such application.

Mode of operation:

Continuous duty.

AirSep Corp. — FreeStyle Service Manual

2.0 Operation Check and Test of Oxygen Concentration

2.1 Description of Operation

Air enters the FreeStyle Oxygen Concentrator through an external air intake /
gross particle filter. This filtered air enters the compressor via a suction intake
muffler that quiets the compressor’s suction sound. Pressurized air then exits
the compressor and passes through a heat exchanger to reduce the
temperature.
Next, a two-way solenoid feed valve directs the air into one of two sieve beds
that contain molecular sieve. The unique property of molecular sieve enables
it to physically attract (adsorb) nitrogen when air passes through this material,
thereby separating the nitrogen from the oxygen in ambient air.

There are two sieve beds: While one produces high-concentration oxygen, the
other is purged of the nitrogen it adsorbed (collected) while it made oxygen.
Oxygen exits the product tank after first passing through the integrated
product filter.

In addition to the molecular sieve beds that allow oxygen to be separated from
air, FreeStyle contains an Oxygen Conserving Device (OCD) valve that
controls delivery of high-concentration oxygen to the patient at the point in
the breathing cycle when the patient starts to inhale.

FreeStyle delivers a gas consisting of 90% (+5.5/-3% )oxygen at pulse flow
rates from approximately 1–3 LPM equivalency.

2.2 Operation Check

AirSep tests every FreeStyle Oxygen Concentrator thoroughly after
manufacture. You must perform the following test to ensure that no damage
occurred in shipping or handling.

1. Connect the power cord of the unit, and turn the unit on by pressing
flow setting [-2]. Check to see that the following sequence occurs:

a. A brief, continuous alarm sounds to indicate that FreeStyle has been turned on.

b. The compressor runs.

c. After a 10 second start up is complete.

d. Exhaust air flows from the unit.

2. Perform an oxygen concentration test, as described in Section 2.4.

AirSep Corp. — FreeStyle Service Manual

2-2 2

2

2

2.3 Alarm System

An audible alarm sounds if FreeStyle has a low battery, senses no
inspiration, or if performance is outside specifications. If an alarm sounds,
observe which lights are on. The visual and audible alarm conditions are
explained in detail below.

2.3.1 Start-Up

A one-second, audible alarm sounds to indicate start-up. FreeStyle begins to
operate when the alarm stops.

2.3.2 Battery Status

To check the level of charge of the internal battery, press the BATT button on
FreeStyle’s keypad. The battery gauge / indicator(s) LEDs above the BATT
button illuminate from 25-100% to indicate the level (capacity) of the internal
battery. At less than 25% capacity, the 25% LED blinks.

2.3.3 Low Battery

As the battery power approaches a low level, a ½ second beep is emitted every
five seconds, and a yellow LED on the battery gauge / indicator(s) will blink
for a ½-second every five seconds. When this occurs, the patient is instructed
to connect the FreeStyle Universal AC or/ DC power supply or change to
another source of oxygen. The low battery alarm will continue for
approximately 2 minutes before FreeStyle stops operating.

2.3.4 Discharged Battery

When the battery is discharged, the unit shuts down. Before this occurs, a ½
second beep sounds every ½ second and the yellow battery LED blinks at the
same rate until any one of the 1-3 settings on the keypad are pressed. After the
alarm is turned off, connect the FreeStyle unit to its Universal AC or / DC
power supply or change to another source of oxygen immediately. When the
FreeStyle unit is connected to the Universal AC or / DC power supply,
FreeStyle operates and the internal battery recharges simultaneously.

AirSep Corp. — FreeStyle Service Manual

2.3.5 Battery Charging

To check the level of charge of the battery, press the BATT button on the keypad. The
battery gauge/indicator(s) illuminate to indicate the level of battery charge (25-100%).

To charge the FreeStyle’s internal battery:

" Connect its Universal AC or / DC (auto) power supply into the

unit’s power receptacle located on the right side of the FreeStyle
unit, and the other end to its proper AC or DC power outlet.

" The FreeStyle internal battery will completely charge from a fully

depleted state in approximately 3½ hours.

" While charging a fully discharged battery, initially the 25% LED

will start blinking rapidly for a few minutes, then start to blink at a
slower rate (½ second).

" The LED will continue to blink until a 25% capacity is reached. The

LED will then turn solid.

" Each of the four LEDs, 25-100%, will blink as stated above, then

turn solid when they reach their capacity.

" Once all LEDs illuminate solid, the battery is fully charged and the

LEDs will remain on solid for approximately 1 ½ hours, then all
four LEDs will turn off.

" If the Universal AC / DC power supply is not connected, the LEDs will turn of within

5 seconds.

Depending upon the temperature of the FreeStyle battery, it can take several minutes for the charging cycle to
start after connecting to power. This is a normal condition and is intended for safe charging.

The lithium ion rechargeable battery that is used in the FreeStyle unit does not need
to be fully depleted before recharging. It is recommended to charge the battery
regardless of the battery’s capacity level after use. The battery will charge when the
unit is off as well as while the unit is running off the AC or DC power supply.

Lithium batteries may permanently lose capacity when exposed to extremely hot
temperatures with the batteries fully charged or completely depleted. For extended storage,
it is recommended that batteries be charged 25 to 50% and remain within a temperature
range of 73 F (23 C).

AirSep Corp. — FreeStyle Service Manual

2-4 2

2.3.6 Battery Fully Charged

When FreeStyle is connected to an AC or DC outlet and is either in operation or is off, the
green 100% battery gauge/indicators displays to indicate that the battery is fully charged.

2.3.7 Cannula Disconnect (No inspiration detected)

When FreeStyle is operating and does not sense breathing within 15
minutes, a red light will illuminate with a constant audible alarm. If this occurs, the
patient should be instructed to check the connection from the cannula to the FreeStyle
unit, make sure that the nasal cannula is positioned properly on the face, and ensure that
you are breathing through your nose. (Your physician may recommend the use of a chin
strap if needed.) If the alarm continues to sound,the patient should change to an alternate
source of oxygen and contact the Equipment Provider.

2.3.8 Performance Warning

If the user’s breathing rate causes the Freestyle unit’s capacity to be exceeded. The
amount of oxygen that FreeStyle supplies is dependent on the flow control switch setting
and the breathing rate. If the breathing rate is too fast for the flow selector setting, the
capacity of FreeStyle can be exceeded. The patient should reduce activity or consider
locating another source of oxygen.

2.3.9 FreeStyle Capacity Exceeded

When the patient’s breathing rate has caused the capacity of FreeStyle to be exceeded, a
1/2-second alarm sounds every 1/2 second, and the red alarm/ service light flashes. When
this occurs, oxygen concentration is outside specifications. The patient should reduce
activity or change to another source of oxygen and contact the Equipment Provider.

2.3.10 General Malfunction

If a general malfunction of the FreeStyle unit occurs, a 1/2 second alarm sounds every 1/2
second, and the red ALARM light turns on. When this occurs, oxygen concentration is
outside specifications. The patient should change to another source of oxygen and contact
the Equipment Provider.

AirSep Corp. — FreeStyle Service Manual 2-5

2.4 Oxygen Concentration Test and Specification

To ensure that FreeStyle’s oxygen output is within specification, you must
perform an oxygen concentration test. Test the unit upon delivery to a patient
and at periodic intervals. Equipment Providers, based upon their own expertise
and documentation, may establish and implement their own protocol to check
oxygen concentration.

1. Connect the FreeStyle Oxygen Concentrator using an AirSep-supplied
Universal AC or / DC power supply only (AirSep Part No. PW017-1) to a
100-240 volt, 50/60 Hz electrical outlet.

2. Turn unit on by pressing setting 2 on keypad.

3. Simultaneously press and hold settings 1 and 3 for 10 seconds. After 10
seconds, the alarm will sound and the LEDs above each flow setting will
illuminate verifying auto pulse mode.

Control Panel

Flow Settings 1 - 3

Figure 2.1

4. Allow unit to warm – up for 5 minutes before recording oxygen
concentration.

5. Connect a calibrated oxygen analyzer to the oxygen outlet and record the
unit’s concentration, a 12” tube is recommended. The specification in test
mode is 87% or higher.

Note Previous AC to DC power AirSep P/N PW010-1 can be used as well.

AirSep Corp. — FreeStyle Service Manual

3-1

3.0 Patient Instructions

3.1 General Instructions

It is important that patients thoroughly understand how to operate AirSep’s FreeStyle unit.
This enables proper treatment as prescribed by a qualified, licensed physician. You must
explain that the purpose of this therapy is to alleviate symptoms. If patients experience
any discomfort or if the unit alarms, they must notify their Equipment Provider and/or
physician immediately.

You, as the Equipment Provider, are responsible to ensure that each patient receives the
FreeStyle Patient Manual. Explain each step in the operation of the unit to the patient with
reference to the patient manual.

3.1.1 Connecting to External Power

When connecting the Universal AC / DC power supply to the FreeStyle unit, be certain to
first properly align the power cord to this inlet. To do this, take note of the “D”-shaped
plug of both the power cord connector and the FreeStyle’s inlet connection. These must be
aligned, and the button on the power cord must be pressed in for removal. This ensures
that neither the unit nor the power accessories are damaged.

FreeStyle unit’s
power inlet

Press to remove
power cord.

“D”-shaped power cord plug
connects to the FreeStyle unit’s
“D”-shaped power inlet.

Figure 3.1

3.1.2 Optional AirBelt™ Battery

Instruct patients that connecting an optional AirBelt to the unit by inserting
the power into the unit’s power inlet provides additional total run time, per the
specifications. Note that the unit battery must still have a charge remaining before the
external AirBelt is connected. The patient should be advised to not fully deplete the unit
battery as a small amount of power is needed to engage the AirBelt.

AirSep Corp. — FreeStyle Service Manual

3-2

To charge the AirBelt battery:

1) Release safetycap from end of the AirBelt cord.

2) Connect the AC/DC power supply (included with the AirBelt Accessory kit) to the end of AirBelts

power cord as shown in Figure 12.

3) Connect the AirBelt power supply to an AC electrical outlet to recharge.

Replace safety cap on AirBelt cord when not in use.

Do not attempt to charge the optional AirBelt with the any other power supply or the AirBelt can
be damaged. Use only the AirBelt power supply provided to charge AirBelt.

" The FreeStyle AirBelt will completely recharge from its fully depleted state in approximately 3 ½ hours.
" While charging a fully discharged battery, the LED will continue to blink until 25% capacity is reached. The

LED will then turn solid.

" Each of the four LEDs, 25% -100%, will blink as stated above, then turn solid when the battery reaches

it’s capacity.

" When all LEDs illuminate solid, the battery is fully charged and the LEDs will remain solid for a period of

time, then all four LEDs will turn off.

The incorrect use of AirBelt can cause it to get hot, ignite, and may cause serious injury. Be
sure not to pierce, strike, step on, or drop the battery, or otherwise subject the battery to strong
impacts or shocks.

Figure 3.2: AirBelt Battery Charging set up

AirBelt

AC/DC Power Supply
Connecting the AirBelt cord to the power supply cord

AirSep Corp. — FreeStyle Service Manual

3-3

Depending upon the temperature of the AirBelt battery, it can take several minutes for
the charging cycle to start after connecting to power. This is a normal condition and is
intended for safe charging.

AirBelt does not need to be fully discharged before recharging. It is recommended to
charge it after each use.

If the AirBelt power supply remains connected when it is fully charged, the four LEDs
will turn off within ½ hour.

Lithium batteries may permanently lose capacity when exposed to extremely hot
temperatures with the batteries fully charged or completely depleted. For extended storage,
it is recommended that batteries be charged 25 to 50% and remain within a temperature
range of 73 F (23 C) +/- 2C.