EFOY Li 70 User manual

Thank you!
Congratulations on choosing an EFOY lithium battery from SFC Energy AG.
We hope you enjoy your new power supply. If you have any questions about installation
or operation, please contact your sales partner or the EFOY hotline.
Copyright by SFC Energy AG 2021. All rights reserved.
Specifications may be changed without prior notice. Revised March 2021
Notes on safe operation
Read the operating instructions before commissioning. For your own
safety, follow the instructions and warnings in these operating
instructions. Store the operating instructions near the EFOY lithium
battery.
WARNING
The EFOY lithium battery is intended for operation in a well-ventilated
place and must be protected from direct weather influences, especially
from moisture ingress.
Do not open the EFOY lithium battery and avoid damage of all kinds.
Modifications to the EFOY lithium battery endanger safety and
invalidate the guarantee or warranty.
Only transport in an upright position.
Protect the EFOY lithium battery against heat and direct sunlight.
Observe the temperature specifications for operation and storage in
SECTION
2.3.4.
Do not store and operate the EFOY lithium battery in temperatures
below –20 °C or above 45 °C. The ideal storage and operating
temperature is between 10 °C and 25 °C.
Keep the EFOY lithium battery away from sources of heat and ignition,
as well as flammable materials.
Keep the EFOY lithium battery away from children.

Service and contact
SFC Energy AG
Eugen-Sänger-Ring 7
85649 Brunnthal
Germany
Hotline: [phone]
Toll-free number*: 00800 732 762 78
E-mail: [e-mail]
Web: www.efoy.com
*The toll-free number can be called free of charge from a landline telephone in the following
countries: Austria, Belgium, Denmark, France, Germany, Great Britain, Italy, the Netherlands,
Norway, Spain, Sweden and Switzerland.

Safety
Page 27
Contents
1Safety................................................................................................................................................28
1.1 Explanation of signal words ..............................................................................................................28
1.2EFOY lithium battery safety instructions ........................................................................................29
1.3 Certificates ............................................................................................................................................... 31
1.4 Transportation and disposal .............................................................................................................32
2Design and specifications...........................................................................................................33
2.1 Product contents....................................................................................................................................33
2.2 Connections EFOY lithium battery.................................................................................................... 34
2.3 Specifications..........................................................................................................................................34
3Commissioning the EFOY lithium battery................................................................................38
3.1 Installing the EFOY lithium battery ...................................................................................................38
3.2 Initial commissioning............................................................................................................................38
3.3 Connecting the charging and load cables ....................................................................................39
3.4 Important information ...........................................................................................................................39
3.5 Connecting an optional EFOY Bluetooth Adapter BT2..............................................................39
3.6 Connecting to an EFOY fuel cell ........................................................................................................41
3.7 Connecting several EFOY batteries.................................................................................................43
4Servicing the EFOY lithium battery............................................................................................44
4.1 Replacing and cleaning the battery................................................................................................ 44
4.2 Place the battery in sleep mode.......................................................................................................44
5Remedying malfunctions ............................................................................................................45
5.1 Malfunctions when using the optional EFOY Bluetooth Adapter BT2 with messages .. 45
5.2 Malfunctions not indicated by messages.....................................................................................45
6Glossary ...........................................................................................................................................46
7Software licenses of third-party suppliers used....................................................................47

Safety
Page 28
1Safety
1.1 Explanation of signal words
DANGER
Indicates a hazard with a high degree of risk which, if not avoided, will result in
death or serious injury.
Pay attention to the danger warning.
WARNING
Indicates a hazard with a medium degree of risk which, if not avoided, can result
in death or serious injury.
Pay attention to the danger warning.
CAUTION
Indicates a hazard with a low degree of risk which, if not avoided, can result in
minor or moderate injury.
Pay attention to the danger warning.
INFO
Indicates an action that can cause material damage.
Pay attention to the information.
Includes further information and tips on using the EFOY lithium battery in an
optimal way.

Safety
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1.2 EFOY lithium battery safety instructions
WARNING
The battery must be permanently installed and may only be operated with an
intact, undamaged housing.
Secure the EFOY lithium battery against accidents and use the appropriate
belt strap or clamps.
WARNING
EFOY lithium batteries are not intended for use as an emergency power supply
for medical, life-sustaining or agricultural equipment.
CAUTION
Non-approved parts may damage the EFOY lithium battery, posing a risk of
injury.
Use original accessories only.
DANGER
Risk of electric shock!
The EFOY lithium battery is splash-proof
(IP 44), but may not be exposed to strong water jets or be submerged.
Infiltrating water presents an injury risk.
Ensure that no water enters the EFOY lithium battery.
Install the EFOY lithium battery in an area protected from water jets.

Safety
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Safety instructions for electronics
DANGER
Risk of fire! Incorrectly installed or dimensioned cables can cause a fire.
The battery may only be installed and commissioned by trained specialists,
taking into account the existing rules and regulations.
Ensure that all connected lines have sufficient insulation and electric
strength.
Ensure that the contact points cannot be touched.
Ensure that there are suitable fuses in the line.
Do not install any bare metal cables or contacts.
When used in a motor vehicle, the battery terminal not connected to the
body must be connected first. Make the other connection to the body at a
distance from the battery and gasoline line.
WARNING
The EFOY lithium battery may overheat without sufficient air circulation.
Use the EFOY lithium battery in a dry, clean and well-ventilated room.
CAUTION
Only use chargers intended for charging LiFePO4batteries and which comply
with the charging specifications of the EFOY lithium battery.
CAUTION
Extended storage without charging can lead to deep discharge and thus damage
the EFOY lithium battery.
Ensure that the EFOY lithium battery voltage lies in the range between
12.0 V and 13.8 V. Charge the EFOY lithium battery prior to long-term
storage (e.g., in winter) and disconnect all loads from the charger, ideally
by removing the cables from the negative battery terminal. Examine the
charge condition at least every three months.

Safety
Page 31
1.3 Certificates
1.3.1 Declaration of conformity
The SFC Energy AG company (Eugen-Sänger-Ring 7, 85649 Brunnthal, Germany)
declares that the following devices comply with the regulations of EU Directives
2014/30/EU (electromagnetic compatibility), 2011/65/EU and 2015/863
(restriction on the use of certain hazardous substances in electrical and
electronic equipment RoHS) and REACH Directive (EC) No. 1907/2006 REACH:
EFOY Li 70 – 12 V, EFOY Li 105 – 12 V
The following harmonized standards were applied: DIN EN 62619,
DIN EN 61000-4-2/-3/-4/-5/-6/-8, DIN EN 61000-6-2/-3, DIN EN 55016-2-1/-3,
DIN EN 55022.
1.3.2 Seals of approval
EFOY lithium batteries have been tested for electromagnetic compatibility in
accordance with ECE Regulation No. 10 and approved for operation in motor
vehicles:
Seals of approval: E24 10R - 05 3278
1.3.3 Warranty
The warranty period begins with the purchase of a new EFOY lithium battery and only
takes effect following registration. Retain the purchase receipt in a secure place.
Warranty service is based on the warranty conditions of SFC Energy AG, valid at the time
of purchase for the respective country. Observe the warranty conditions accompanying
the product or available at www.efoy.com.

Safety
Page 32
1.4 Transportation and disposal
Information on transportation can be obtained by calling the EFOY hotline.
WARNING
Risk of suffocation
from films and folding boxes.
Keep packaging and parts of packaging away from
children
.
The EFOY lithium battery is protected by packaging. All materials used are
environmentally friendly and recyclable.
With regard to transportation, the batteries belong to category UN3480, class 9,
packaging group II. For see- or road transport (ADR, RID & IMDG), packaging instruction
VA903 must be followed and packaging instruction VA965 for air transportation (IATA).
The original packaging meets these specifications. You should therefore retain the
packaging.
In accordance with EU Directive 2012/19/EU, EFOY lithium batteries are registered
under WEEE Reg. No. DE 85008411.
Defective batteries may not be disposed of in household waste. Return the used or
defective battery with isolated battery terminals to the manufacturer or to an authorized
battery disposal center. Information on returning old devices can be obtained by calling
the EFOY hotline.

Design and specifications
Page 33
2Design and specifications
2.1 Product contents
Description
Pcs.
No.
EFOY Li 70 Ah – 12 V or
EFOY Li 105 Ah – 12 V 1 1
Activator 1 2
Sealing plug 2 3
Vehicle terminal connection
adapter 2 4
Operating instructions 1
Warranty conditions 1
Optional
EFOY Bluetooth Adapter BT2 1 5
Keep all parts in a safe place.

Design and specifications
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2.2 Connections EFOY lithium battery
1Positive terminal: red
2Negative terminal: black
3SFC Bus
4SFC Bus and connection for Activator
or EFOY Bluetooth Adapter BT2
5Overpressure protection
The two terminals 3 and 4 can be used for data communication with one of the following
EFOY fuel cells:
•EFOY 80/150
•EFOY Pro 900/1800/2800
Terminal 4 is also suitable for communications with an EFOY Bluetooth Adapter BT2.
2.3 Specifications
2.3.1 General information
EFOY Li 70 – 12 V
EFOY Li 105 – 12 V
Battery type
Lithium iron phosphate (LiFePO4)
Nominal voltage
12.8 V
Nominal capacity
70 Ah
105 Ah
Energy 896 Wh 1,344 Wh
Dimensions
(L x H x D) in [mm] 269 x 190 x 175 368 x 190 x 175
Weight in [kg] 11.8 16.3
Protection class
IP 44, splash-proof in all directions
Terminal M8/optional: Vehicle battery terminal (accessory
provided)
Angle
Continuous 90° possible

Design and specifications
Page 35
Battery management
system (BMS)
Integral
Safety devices Overvoltage, undervoltage, overtemperature, short-
circuit
Application/wiring
12 V installation
Parallel circuit possible
Series circuit not allowed
Battery designation
compliant with DIN EN
IFpR33/71[12P4S]M/-10+60/95 IFpR33/71[18P4S]M/-10+60/95
2.3.2 Charging properties
EFOY Li 70 – 12 V
EFOY Li 105 – 12 V
Charging end voltage
14.6 V
Open-circuit voltage 13.2 to 13.8 V
Max. charging current
(< five minutes)
70 A 105 A
Max. continuous charging
current
(10–30 °C)
1
35 A 52 A
Charging duration at 20 °C
and max. continuous
charging current
< 2 h
Charging characteristic
CCCV/IU
No. of charging cycles
Approx. 3,000 cycles at 80% DOD
Storage Examine the state of charge at least every three months
and charge if necessary
2.3.3 Discharge properties
EFOY Li 70 – 12 V
EFOY Li 105 – 12 V
Deep discharge protection < 10.5 V
Battery enters deep discharge protection mode
Recommended minimum
voltage
11 V
Continuous discharge
current
70 A 105 A

Design and specifications
Page 36
Max. discharge current
(< five minutes)
150 A 200 A
Max. discharge current
(< five seconds)
230 A 300 A
2.3.4 Temperature properties
EFOY Li 70 – 12 V
EFOY Li 105 – 12 V
Temperature range:
Charging
2
–20 °C to +45 °C
Temperature range:
Discharge
–20 °C to +60 °C
Heating element function Battery heating between –20 °C and 5 °C
Battery warming by approx. 10 °C per hour 3
Temperature range:
Storage
–20 °C to +60 °C
Recommended storage
and operating
temperature range
+10 °C to +25 °C
(to protect against self-discharge)
1The charging current must be accordingly reduced when charging outside of these temperatures.
2The battery is only charged when the cell temperature (inside the battery) exceeds 0 °C. If a sufficient
charging current of at least 2 A is achieved, the standard heating element heats the battery so that it
can also be charged at outside temperatures below 0 °C to –20 °C.
3At a maximum charging current of at least 2 A.

Design and specifications
Page 37
2.3.5 Dimensions
EFOY Li 70 – 12 V
EFOY Li 105 – 12 V
All specifications obtained through testing under normal conditions. We
reserve the right to make changes to the specifications.

Commissioning the EFOY lithium battery
Page 38
3Commissioning the EFOY lithium battery
3.1 Installing the EFOY lithium battery
•The EFOY lithium battery must always be adequately secured. If necessary,
commercially available accessories should be used (e.g., battery holder with belt
strap).
•A (sponge) rubber mat is recommended as an underlay.
•You can install the battery either upright (positive and negative poles are on top) or
horizontally (positive and negative poles are on the side).
•It is necessary to use a suitable electrical fuse.
3.2 Initial commissioning
The EFOY lithium battery has three modes
oOperating mode
oSleep mode
oDeep discharge protection
The battery is in sleep mode when delivered. The battery can be brought into operating
mode either by using a charger or with the help of the supplied activator. The activator
may need to be plugged into terminal 4 and lights up green as soon as the battery is in
operating mode. This process can take up to five minutes.
Be sure to keep the activator in a safe place. Completely charge the EFOY lithium
battery prior to first use (SOC 100%).

Commissioning the EFOY lithium battery
Page 39
3.3 Connecting the charging and load cables
•Always use cables with the appropriate cross-sections.
•First connect the charging cable to the EFOY fuel cell and then any communications
cables. Always connect the positive pole to the battery first.
•Tighten the M8 screws or the adapter screws provided with a torque of 10 to 15 Nm.
The diameters of the adapter screws differ slightly:
- The adapter screw with the smaller diameter is for the positive pole
- The adapter screw with the larger diameter is for the negative pole
3.4 Important information
The EFOY lithium battery may not be charged under the following conditions. Contact
either the EFOY hotline or your service partner.
•The battery is damaged.
Triggering a circuit breaker:
•Ensure that the discharge currents (continuous, five minutes and five seconds) are
no higher than specified in the data sheet. Otherwise an internal, reversible circuit
breaker will be triggered in the battery and the battery will switch off for approx. one
minute. It then returns to the operating mode when the discharge currents are
within the allowable limits.
If the battery voltage falls below 10.5 V, the battery automatically enters deep discharge
protection mode. In this mode, all functions are switched off to minimize power use. The
battery can only be returned to the operating mode by charging. This process may take
some time.
3.5 Connecting an optional EFOY Bluetooth Adapter BT2
You can purchase an EFOY Bluetooth Adapter BT2 which, in conjunction with a free app,
offers useful operating options and clear information.
•You can operate the EFOY lithium battery via the EFOY App.
•The EFOY App is available free in the App Store and in Google Play. The myEFOY
function of the EFOY App is available from Android version 4.4 and iOS 8.0 for
Bluetooth 4.0-capable devices. All important information about the EFOY lithium
battery is available in the EFOY app.

Commissioning the EFOY lithium battery
Page 40
You can download the App directly using QR codes
iOS operating system Android operating system
More information can be found at www.efoy.com
The EFOY App requires the EFOY Bluetooth Adapter BT2 and the current firmware.
Connect the EFOY Bluetooth Adapter BT2 as shown in the figure below.
Initial commissioning:
In the App, tap myEFOY.
Enter the serial number of your EFOY lithium battery.
The following screen then appears:

Commissioning the EFOY lithium battery
Page 41
1
EFOY battery overview
2
Information on charging and
discharging the battery
3
To the EFOY Lithium Battery
details screen
4
Menu
3.6 Connecting to an EFOY Fuel Cell
An EFOY fuel cell is the best charger for the EFOY lithium battery and significantly
extends the service life of the battery.
The latest generation of EFOY fuel cells (EFOY 80/150 and EFOY Pro 900/1800/2800) can
optimally charge the battery even at sub-zero temperatures and communicate with the
battery. The state of charge display (SOC) of the battery in connection with these fuel
cells is much more accurate than with conventional LiFePO4batteries. Information on
installing and connecting the EFOY fuel cells can be found in the October 2020 revision
of the EFOY fuel cell mounting instructions at www.efoy.com.
Use the charging cable provided in the EFOY fuel cell product contents. Two optionally
available connecting kits, which consist of a data cable, a port doubler RJ12 and an SFC
Bus End Piece, are available to connect the battery to the EFOY fuel cell. One connecting
kit includes a 3 m long data cable and the other a 10 m long data cable.
The data connection between an EFOY fuel cell and an EFOY battery is provided by the
SFC Bus. An SFC Bus End Piece must be inserted into one of the two data RJ12
connectors on the battery at the end of this SFC Bus connection.

Commissioning the EFOY lithium battery
Page 42
The activator for the EFOY lithium battery and the SFC Bus End Piece are
similar in appearance. Both components are labeled for differentiation.
Ensure that you do not mix the two components.
Connect the cables in the following sequence to connect the EFOY fuel cell to the EFOY
lithium battery:
1. Push the large plug connector with the four individual cables into the fuel cell
2. Then connect the positive pole to the battery first, followed by the negative pole
3. Connect the data cable and, if available, the EFOY Bluetooth Adapter BT2 to the
EFOY Fuel Cell via the port doubler
4. Plug the data cable and SFC Bus End Piece into the two RJ12 inputs on the battery.
The cable and end piece are not allocated to the two RJ 12 inputs, and therefore
this is irrelevant
The EFOY App provides you with information from both the EFOY Fuel Cell
and the EFOY Lithium Battery. To do this, the EFOY Bluetooth Adapter BT2
must be plugged into the EFOY Fuel Cell (see picture below).

Commissioning the EFOY lithium battery
Page 43
3.7 Connecting several EFOY batteries
•EFOY lithium batteries can be connected in parallel.
•Ensure they are wired correctly (see figure below).
•Connecting the batteries in series leads to defects and is not permitted.

Servicing the EFOY lithium battery
Page 44
4Servicing the EFOY lithium battery
4.1 Replacing and cleaning the battery
If present, disconnect the data cable and then the charging cable: the negative
pole first.
Do not reconnect the charging cable until you have replaced the battery or are
finished working on the battery.
4.2 Place the battery in sleep mode
The EFOY lithium battery can be put into the sleep mode using the EFOY App and
optionally available EFOY Bluetooth Adapter BT2 for storage or transportation purposes.
In this mode, power consumption is minimal, and the state of charge (SOC) only falls
very slowly. No communication takes place. The battery can be returned to the
operating mode from the sleep mode using the activator.