LITHTECH TW6000-PRO Energy Storage System User Manual

LITHTECH TW6000-PRO Energy Storage System

Product Information

• Product Name : Energy Storage System TW6000-PRO
• Manufacturer: Shenzhen Lithtech Energy Co., Ltd.
• Copyright: The copyright of this product belongs to Shenzhen Lithtech Energy Co., Ltd. Without written permission, no unit or individual may extract, reproduce, or translate the content in any way.
• Compliance: This product complies with the design requirements for environmental protection and personal safety.
• Product Update: For any product updates or technical changes, related information can be obtained through the technical support website of Shenzhen Lithtech Energy Co., Ltd.
• Version: 1.0
• Date: 2021.02.25
• Content: Initial Release

Product Usage Instructions

Precautions:

• Warning:
  • Do not place the battery in water or fire to avoid explosion or other dangers.
  • Ensure proper connection of cables during installation and avoid reversing the positive and negative poles. Do not directly connect the battery’s positive and negative poles with a conductor (such as a wire) to prevent short-circuiting.
  • Avoid striking the battery with a needle, or hammer, or applying excessive force.
  • Prior to moving or rewiring the system during use, ensure complete power cutoff and system shutdown to prevent electric shock hazards.
  • In case of fire, use a dry powder fire extinguisher to extinguish the fire. Using a liquid fire extinguisher may cause secondary dangers.
  • Do not disassemble any part of the system without authorized personnel to prevent personal safety risks. Unauthorized disassembly will void the warranty.
• Reminders:
  • If the purchased product shows abnormal phenomena such as deformation or odor, contact the manufacturer immediately.
  • Ensure proper grounding of the equipment before use to ensure normal use and safety.
  • Check and ensure compatibility of electrical parameters of related equipment before use to avoid any issues.
  • Do not mix batteries from different manufacturers, types, models, or old and new batteries.
  • Consider the use of environment and storage methods to ensure the product’s service life and reliability. Install and use the system in a suitable environment.
  • For long-term storage, recharge the battery once every 6 months, exceeding the rated capacity by 80%.
  • If the battery is discharged to over-discharge protection, recharge it within 24 hours. The discharge time can be calculated using the formula: t = C / I (where t is the discharge time, C is the battery capacity, and I is the total load current).

Legal Notices

The copyright of this product belongs to Shenzhen Lithtech Energy Co., Ltd. Without the written permission of the copyright party, no unit or individual may extract, reproduce or translate in any way. Infringement must be investigated. This product complies with the design requirements for environmental protection and personal safety. The storage, use and disposal of the product should be in accordance with the requirements of the product manual, relevant contract or corresponding national laws and regulations.

When there is a product update or a technical change, you can inquire related information through the technical support website of Shenzhen Lithtech Energy Co., Ltd. Website: http://www.ltc-energy.com/.

If this product is improved or technically changed without notice.

Precautions

Warning

1. It is strictly forbidden to place the battery in water or fire, so as to avoid explosion or other dangers, endangering personal safety.
2. Please connect the cables properly during installation, do not reverse the positive and negative poles; do not directly connect the positive and negative poles of the battery with a conductor (such as a wire) to avoid short-circuiting the battery.
3. Do not strike the battery with a needle, hit it with a hammer, step on it hard, or otherwise.
4. During use, when the system needs to be moved or rewired, the power must be completely cut off and the system must be completely shut down, otherwise there will be danger of electric shock.
5. In case of fire, please use dry powder fire extinguisher to extinguish the fire. Using liquid fire extinguisher may cause secondary danger.
6. Under no circumstances, please do not disassemble any part of the system without our company or technical personnel authorized by our company, in order to prevent danger or injury to your personal safety, and the equipment failure caused by this is not covered by the warranty.

Remind

1. The product has been strictly inspected before shipment. If you find that the purchased product has abnormal phenomena such as obvious deformation and odor, please contact us in time.
2. In order to ensure the normal use and safety of the product, the equipment must be reliably grounded before use.
3. In order not to affect the normal use, please ensure that the electrical parameters of the related equipment are compatible and compatible with each other before use.
4. Do not mix batteries from different manufacturers, different types, different models, and old and new batteries.
5. The use environment and storage methods have a certain impact on the service life and reliability of this product, so environmental factors must be fully considered before installation and use to ensure that the system is used in a suitable environment.
6. For long-term storage, the battery needs to be recharged once every 6 months, and the recharged power should exceed the rated capacity by 80%.
7. After the battery is discharged to over-discharge protection, it should be recharged within 24 hours. The theoretical battery discharge time is: t = C / I (t is the discharge time, C is the battery capacity, and I is the total load current.)

Foreword

Manual Description
TW6000(6000P) lithium iron phosphate battery storage system can provide power storage function for photovoltaic power generation users through parallel combination. During the day, the excess power of solar energy can be stored in the battery, and at night or when needed, the stored energy is used to power electrical equipment, which can improve the efficiency of solar energy, peak shaving, and emergency power backup.

This user manual system introduces the basic structure, parameters, installation, operation and maintenance of the equipment in detail.

Introduction

The TW6000(6000P) lithium iron phosphate battery system is a standard battery system unit. Customers can choose a certain quantity of TW6000(6000P) according to their needs, and form a larger capacity battery pack in parallel to meet users’ long-term power supply needs. The product is especially suitable for applications with high operating temperatures, limited installation space and long service life.

Product Features

The TW6000(6000P) battery system uses lithium iron phosphate as the battery anode material and is equipped with a high-performance BMS to effectively manage the battery cells. The system has the following characteristics:

• Meet European ROHS regulations, pass SGS certification, use the best non-toxic and pollution-free battery;
• The battery anode is made of lithium iron phosphate (LiFePO4) material, which has good safety performance and long cycle life;
• Adopt high-performance BMS battery management mode, with over-discharge, over-charge, over-current, temperature and other protection functions;
• With charge and discharge automatic management and single cell balance function;
• Fully intelligent design, equipped with a centralized monitoring module, with three remote (telemetry, remote signaling and remote control) functions;
• Flexible configuration, multiple system units connected in parallel can extend the power supply time of the system;
• Self-cooling method, the whole system has extremely low noise;
• The battery has less self-discharge, and it can be recharged for up to 10 months during storage; no memory effect, shallow charging and discharging;
• Wide temperature working range, -20 ℃ ~ + 55 ℃, good cycle life and discharge performance at normal temperature;
• Small battery size and is lightweight.

Product Identification Definition

Specifications

Size & weight

Table 2-1 TW6000(6000P) Standard sizes

Performance parameter

Table 2-2 Performance parameter table

Interface Definition
TW6000(6000P) Product panel interface configuration and functions. This section details the functions of each interface on the front panel of the device.

Fig. 2-3 Interface diagram

5

| SW（Wake on battery / Sleep switch)| When the “OFF / ON” key is ON, press and hold this key for 3 seconds.Put the battery into the

power-on or hibernation state.

6| SOC| The number of green lights shows the remaining battery power, as shown in Table 2-3.

7

|

ALM

| Red light, flashing when alarm. Protection is always on. Conditions that trigger protection

Normally recover automatically after lifting

8| RUN| Green light, flashing during standby, flashing during charging, and always on when discharging
9| RS232| Debug communication port, support RS232 communication
10

11

| CAN/RS485

COM0、COM1

| Host external communication port, support CAN and RS485 communication

Slave internal parallel communication port, support RS485 communication

12| DRY CONTACT| Dry contact
13| Switch| OFF/ON，Must be “ON” when used

Definition and description of DIP switch
When PACK is used in parallel, you can use the DIP switch on the BMS to set the address to distinguish different PACKs. Avoid setting the same address. The definition of the BMS DIP switch is shown in the table below.

Table 2-3 Dip switch dial definition

Indicator definition and description
Table 2-4 LED working status indication

Status

| Normal/ Alarm / Protection| RUN| ALM| Battery indicator LED| Description
---|---|---|---|---|---
| | | | | |
Shutdown| Dormant| off| off| off| off| off| off| All off

Standby

| Normal| F1| off| According to battery indicator| standby mode
Alert| F1| F3| Module low voltage

Charge

| Normal| on| off| According to battery indicator

(Battery indicator flashes up to 2 LEDs)

| Highest power LED blinks (blink 2), ALM does not blink during overcharge

alarm

Alert

|

on

|

F3

Over charge protection|

on

|

off

|

on

|

on

|

on

|

on

| If there is no utility power, the indicator light

Go to standby.

Temperature, overcurrent, Fail-safe|

off

|

on

|

off

|

off

|

off

|

off

|

Stop charging

Discharge

| Normal| F3| off| According to battery indicator|
Alert| F3| F3
Under voltage

protection

|

off

|

off

|

off

|

off

|

off

|

off

|

Stop discharging

Temperature, over current, Short circuit, Reverse

connection, Fail-safe

|

off

|

on

|

off

|

off

|

off

|

off

|

Stop discharging

Lapse|  | off| on| off| off| off| off| Stop charging& discharging

Remarks: Flash 1 is short for F1; Flash 2 is short for F2; Flash 3 is short for F3.

Table 2-5 Capacity instructions

Capacity indicator

| RU N

| AL M

| L4

| L3

| L2

| L1

| RU N

| AL M

| L4

| L3

| L2

| L1

Battery

（%）

| SOC≤0%| on| F3| off| off| off| off| off| off| off| off| off| off
0<SOC≤25%| on| off| off| off| off| F2| F3| off| off| off| off| on
25<SOC≤50%| on| off| off| off| F2| on| F3| off| off| off| on| on
50<SOC≤75%| on| off| off| F2| on| on| F3| off| off| on| on| on
75<SOC<100%| on| off| F2| on| on| on| F3| off| on| on| on| on
SOC≥100%| on| off| on| on| on| on| F3| F3| on| on| on| on
 Running lights| on| F3
---|---|---

Table 2-6 Flash description

Remarks:
Flash 1 is short for F1;Flash 2 is short for F2;Flash 3 is short for F3.

Notes:
The alarm can be enabled or disabled through the host computer. The factory default is enabled.

Buzzer action description

• When the fault occurs, every 1S will beep 0.25S;
• When protecting, every 2S will beep 0.25S (except for overvoltage protection):
• When the alarm occurs, every 3S will beep 0.25S (except for overvoltage alarm);
• The buzzer function can be enabled or disabled by the host computer. The factory default is disabled.

Button description

• When the BMS is in the dormant state, press the button (3 ~ 6S) and release it, the protection board is activated, and the LED indicator lights up sequentially for 0.5 seconds from “RUN”. When the BMS is in the activated state, press the button (3 ~ 6S) and release it, the protection board will be dormant, and the LED indicator will turn on for 0.5 seconds starting from the lowest battery.
• When BMS is activated, press the button (6 ~ 10S) and release, the protection board is reset, and the LED lights are all the same Lights for 1.5 seconds.

After the BMS is reset, the parameters and functions set by the host computer are still retained. If the original parameters need to be restored, they can be implemented by the “restore default values” of the host computer, but the related operation records and stored data remain unchanged (such as power, cycle times, Protect records, etc.).

Sleep and wake

Sleep
When any of the following conditions are met, the system enters the low-power mode:

1. Single or overall over-discharge protection has not been released within 60 seconds.
2. Press the button (3 ~ 6S), and release the button.
3. The minimum cell voltage is lower than the sleep voltage, and the duration reaches the sleep delay time (at the same time, no communication, no protection, no balance, no current).
4. Standby time exceeds 24 hours (no communication, no charge and discharge, no mains).
5. Force shutdown by PC software.

Before entering hibernation, make sure that the input terminal is not connected to external voltage, otherwise it will not be able to enter the low power consumption mode.

Wake
When the system is in the low power consumption mode and meets any of the following conditions, the system will exit the low power consumption mode and enter the normal operation mode:

• Connect the charger. The output voltage of the charger must be greater than 48（51.2）V.
• Press the button (3 ~ 6S), and release the button.

Note:
After single or overall over-discharge protection, it enters low power consumption mode, and wakes up at regular intervals every 4 hours to turn on charge and discharge MOS. Such as Can be charged, it will exit hibernation and enter normal chrging; if it cannot be charged after 10 consecutive automatic wake-ups, it will no longer To wake up.

When the system is defined as the end of charging, the recovery voltage is not reached after 2 days of standby (standby time set value), and the charging is forcibly resumed until the end of recharging.

RS232 communication
The BMS can communicate with the host computer through the RS232 interface, so that it can monitor various battery information, including battery voltage, current, temperature, status, and battery production information. The default baud rate is 9600bps.

RS232–using 6P4C vertical RJ11 socket

RJ12 pin| Definition description| note
1| NC| empty
2| GND|
3| TXD|
4| RXD|
5| GND|
6| NC| empty

CAN communication
CAN communication, the default communication rate is 500K.

RS485 communication
With dual RS485 interface, you can check the information of PACK. The default baud rate is 9600bps. If you need to communicate with the monitoring equipment through RS485, the monitoring equipment acts as the host and polls data according to the address.The address setting range is 2 ~ 15.

CAN / RS485–using 8P8C vertical RJ45 socket

RJ45 pin| Definition description| note
1| RS485-B1|
2| RS485-A1|
3| GND| 485 and CAN common ground
4| CANH|
5| CANL|
6| GND| 485 and CAN common ground
7| RS485-A1|
8| RS485-B1|

COM0–using 8P8C vertical RJ45 socket| COM1–Using 8P8C

vertical RJ45 socket

---|---
RJ45 pin| Definition description| RJ45 pin| Definition description
1、8| RS485-B| 9、16| RS485-B
2、7| RS485-A| 10、15| RS485-A
3、6| GND| 11、14| GND
4、5| NC| 12、13| NC

Battery Management System（BMS）

Low Voltage Protection

Discharge low voltage protection:
When discharging, the voltage of any single cell is lower than the protection value, the over discharge protection will be started, the battery buzzer alarm. When the voltage of all cells is recovered to the range of released value, the protection is removed.

Charging Over Voltage Protection:
During charging, when the total voltage of battery pack or the voltage of any single cell reaches the protection value, the system stops charging. When the total voltage and the single voltage return to the released value range, the protection will be released.

Current Protection

Charging Over Current Protecion:
When the charging current is more than the protection value, the battery buzzer will alarm and the system will stop charging. The protection will release after the system delays the rated time.

Discharging Over Current Protection:
When the discharge current is more than the protection value, the battery buzzer will alarm and the system will stop discharging. The protection will release after the system delays the rated time.

Note: The buzzer alarm setting can be manually closed on the computer, and it is opened by default

Temperature Protection

Charge low/high temperature protection:
During charging, when the battery temperature exceeds the range of – 0 ℃ ~ + 55 ℃, the system starts the charging temperature protection, stops charging, recovering to the rated return value, and then the protection is released.

Discharge low/high temperature protection:
During charging, when the battery temperature exceeds the range of -20℃~+55℃, the system starts the charging temperature protection, stops charging, recovering to the rated return value, and then the protection is released.

Other Protection

Short circuit protection:
When the battery is activated from the off state, if there is a short circuit, the system will start the short circuit protection for 30 seconds

Shut down automatically:
When the equipment has no external load and power supply for 10 hours, it will automatically shut down.

Note: The max.discharge current of battery should be bigger than max.working current required for load.

Installation and configuration

Installation &Prepration

Safety Regulation
Only the personnel who have received the electrical system training and fully mastered the electrical knowledge can install this system. Always follow the safety regulations listed below and local safety regulations during installation

• All circuits with external voltage less than 48V connected to the power system must meet SELV requirements defined in IEC60950
• If operating inside the cabinet, make sure that the power system is not active. The battery shall also be shut down
• The cables shall be arranged reasonably and protected to avoid touching these cables when operating the power equipment
• It is recommended to wear the following safety gear when dealing with the battery pack.

Environment Requirement

• Working Temperature -20℃～+55℃
• Storage Temperature: -10℃～+35℃
• Relative Humidity: 5%～85%RH
• Altitude: < 4000m

Working environment: there is no conductive dust and corrosive gas, and the following conditions are met:

• The installation site shall be far away from the sea to avoid salt water and high humidity environment
• The ground is flat and level
• There are no inflammables and explosives in the accessories of the installation point
• The ideal ambient temperature is 15 ~ 30 ℃
• Keep away from dust and dirty areas

Tools
The tools and meters that may be used in Table 3-1:

Name

screwdriver Slotted screwdriver Phillips screwdriver| multimeter
Torque wrench| Clamp meter
Diagonal pliers| Insulation tape
Needle-nose pliers| thermometer
Wire cutter| Anti-static bracelet
Wire stripping pliers| Tie
Electric drill| Tape measure

Technical preparations

Electrical interface check
Devices connected directly to the battery can be user equipment, power supplies, or other power devices.

• Confirming whether the user’s photovoltaic power generation equipment, power supply or other power supply equipment has a direct current output interface, and measuring whether the output voltage of the direct current interface meets the voltage range requirements in 2.2 performance parameter table.
• Confirming that the maximum discharge current capacity of the DC interface of the user’s photovoltaic power generation equipment, power supply or other power equipment should be greater than the maximum charging current of the product used in the performance parameter table. For the maximum charging current of the product used, the DC interface of the user’s photovoltaic power generation equipment should have a current limiting function to ensure the normal operation of the user equipment first.
• Make sure that the maximum operating current of the battery-powered user equipment (inverter DC input) should be less than 2.2 The maximum discharge current of the product used in the performance parameter table.

Security check
It is strictly prohibited to place flammable, explosive and other dangerous materials next to the battery. Fire equipment should be available near the equipment, such as portable dry powder fire extinguishers. Where necessary, an automatic fire protection system should be provided.

Unpacking inspection

• When the equipment arrives at the installation site, it must be loaded and unloaded in accordance with regulations to prevent sunlight and rain. Before unpacking, check the total number of pieces according to the shipping list attached to each packing box, and check whether the appearance of the packing box is intact;
• Handle with care during unpacking to protect the surface coating of objects;
• When opening the packaging box, the installer should first read the technical documents and check the list, and check whether the items are complete and intact according to the configuration table and packing list. If the internal packaging is damaged, it must be checked and recorded. The packing list is as follows:

Engineering coordination
Note the following before construction:

• Power cord specifications
  Power cord specifications should meet the maximum discharge current requirements of each product

• Installation space and load
  Ensure that the battery has sufficient installation space, and that the case and bracket where the battery is installed have sufficient load-bearing capacity.

• wiring
  Make sure the power and ground wires are routed properly. Not easy to short circuit, water and corrosion.

Equipment installation
Table 3-2 Table 3-2 Installation steps

Step1| Preparation for installation| 1.Ensure the ON / OFF switch on the chassis is”OFF” state to ensure no-power operation.
---|---|---

Step2

| Mechanical installation| 1. Determine the location of the cabinet
2.Top harness pre-installed
3.Battery module installation

Step3

|

Mechanical installation

| 1.Ground cable installation
2.Battery module parallel cable installation
3.Battery Module Header Cable Installation
4.Battery module total negative cable installation
5.communication interface connection

Step4

|

Battery system self-test

| 1.Press the ON / OFF switch to the “ON” state
2.BMS system power-up activation
3.Check system output voltage
4.Shut down the system

Step5

|

Connect the inverter

| 1.Install battery system total positive and negative cables to the inverter
2.Connect the external CAN communication

cable to the inverter

Preparation for installation

• Equipment and tools ready for installation
• Check the chassis to make sure that the ON / OFF switch is in the “OFF” state toensure no-power operation.

Mechanical installation

Method 1: Pendant bracket installation

1. Put the hanger bracket close to the wall, and mark the wall according to the space，Then use a percussion drill according to the vacancy of the pendant, drill 8 holes with a depth of 100mm
2. Install the expansion screw on the wall so that the expansion iron pipe and the wall parallel.
3. Install the pendant bracket on the expansion screw, and then tighten the nut

Method 2: battery installation

1. Lift the TW6000 (6000P) battery pack and hang it on the bracket.
2. Use 4 M5-20mm screws to lock the bracket and battery pack;

Electrical installation
Before connecting the power supply and ground wire, it is recommended to use a multimeter to measure the on-off and short circuit of the cable, confirm the positive and negative poles, and label the cable.

Measuring method:

• Cable on/off: select the buzzer of the multimeter, and use the probe to measure the two ends of the same color cable . If the buzzer sounds, it means the cable is available.
• Short circuit judgment: select the resistance gear of the multimeter and measure the positive and negative poles at the same end with the probe. If the resistance shows infinite, it means the cable is available.
• Positive and negative poles: after the power line is connected visually, the positive and negative poles of the battery shall be respectively connected to the positive and negative poles of the opposite equipment.

Selection requirements with air switch:

• Voltage：U >60VDC
• Current: I= Inverter power/45V

Remark：

1. When the four sets are used in parallel, the dialing mode is as follows:
2. the host dials the code according to the PNG1,
3. the slave1 dials the code according to the PNG2,
4. When it is used independently, the dial switch does not need to be turned, as shown in PNG3.

Using, maintenance and troubleshooting

battery system use and operation instructions
After completing the electrical installation, turn on the battery system as follows:

1. Refer to the description of dial switch in 2.3.1, make preparations before starting the battery pack, and then press to “ON”, press SW key for 3 seconds, run light and SOC light will be on after self inspection.

Pay attention:
After pressing the power key, if it is found that the battery status indicator on the front panel is on red continuously; please check”4.2 alarm description”. If the fault cannot be eliminated, please contact the dealer in time.

1. Use a voltmeter to measure whether the two voltages at the battery access end of the circuit breaker are over 40V, and check whether the voltage polarity is consistent with the inverter input polarity; if the voltage output at the battery access end of the circuit breaker is over 40V, then the battery has started to work normally;
2. After confirming that the output voltage and polarity of the battery are correct, turn on the inverter; turn off the Circuit breaker switch.
3. Check the status of the indicator light (communication indicator light and battery access status indicator light) between the inverter and the battery. if it is normal, the connection between the battery and the inverter is completed. If the indicator light is different Often, please refer to the inverter manual to find out the reason or contact the dealer.

Table 4-1 Battery and inverter power matching table

Hybrid inverter| Off grid inverter| TW6000(6000P)| Combination box
---|---|---|---
EPS(Backup port)

AC output power

| AC

output power

| Min. parallel connections| Total energy (kWh)|

Specification

| Total Energy (kWh)
≤2.5kW| 1| 10.0| Combination box T-10.0| 10.0
≤5.0 kW| 2| 20.0| Combination box T-20.0| 20.0
≤10.0 kW| 4| 40.0| 2 Combination box T-20.0| 40.0
≤15.0 kW| 6| 60.0| 3 Combination box T-20.0| 60.0
≤20.0 kW| 8| 80.0| 4 Combination box T-20.0| 80.0
---|---|---|---|---
≤25.0 kW| 10| 100.0| 5 Combination box T-20.0| 100.0

Using requirements

|

Charge

| a.          Continuous charging current≤0.5C

b.         If the battery capacity indication is empty, please charge within 48 hours after the power is discharged.

---|---|---

Discharge

| c.          Continuous charging current≤0.5C

d.         It is recommended that the maximum discharge depth (DOD) of the pack should not exceed 80%

Alarm Description and Solution
In case of protection action or fault of the system, the alarm signal will be given through the working status indicator light of the front panel, and the specific alarm category can be queried through the network management system. If there are any abnormal faults affecting the output, such as voltage over-voltage, charging over-current, under voltage protection, temperature protection, etc., please handle according to Table 4-2.

Table 4-2 Main alarm and protection

Charging state

|

Cell overvoltage

| ALM Red light is always on| Stop charging and find out the cause of the fault
Charge overcurrent| ALM Red light is always on| Stop charging and find out the cause of the fault
Charging temperature alarm| ALM Red light is always on| Stop charging

Discharging state

| Discharge overcurrent alarm| ALM Red light is always on| Stop discharging and find out the cause of the fault
Discharging

temperature alarm

| ALM Red light

is always on

| Stop discharging
Total voltage

undervoltage alarm

| ALM Red light

is always on

| Charge
Cell Voltage

Under-voltage alarm

| ALM Red light

is always on

| Charge

Analysis and solution of common faults
Common faults and solutions are shown in table

Table 4-3 Common faults and solutions

1

| No response of indicator light after power on| Power switch is broken|

Power switch

2

| No DC output red light on| Battery data status is abnormal| Network management connect with background

reading battery information

3| DC power supply time is too short| Reduced battery capacity| Replace a battery
---|---|---|---
4| Battery cannot be fully charged| Charging voltage is too low| Adjust charging voltage to 54V

5

| The power cord port sparked at the moment of power on, and the red light

was on

|

Short circuit in power supply wiring

|

Turn off the battery, check the cause of the short circuit and solve it

In case of special technical difficulties or questions, please contact the seller in time.

SHENZHEN LITHTECH ENERGY CO.,LTD

• Room 711, Building A, Zhihui Innovation Center, Xixiang Street, Bao’an District, Shenzhen Postal code: 518101
• E-mail: info@lith-tec.com.
• Website: http://www.ltc-energy.com/.

References

• China Lithium ion battery manufacturer | Lithtech Energy

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