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Daly 4S BMS 12V 40A LiFePo4 Lithium Electric Vehicle Scooter Common Port  Balance Battery Management System

Daly 4S BMS 12V 40A LiFePo4 Lithium Electric Vehicle Scooter Common Port Balance Battery Management System

Product Code: Daly 4S LFP 40A
Reward Points: 45
SKU : 1-101-15941-JO5H FJ18
Product available in stock : 1
  • 780.00₺

  • Ex Tax: 650.00₺
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  • 10000 or more 663.00₺

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Tags: Daly 4S, Daly 12volt, Daly 40A, 4s BMS, 12volt BMS, 40A BMS

Taksit Tutarı
Toplam Tutar
3 x 376,93 TL
1.130,78 TL
6 x 201,94 TL
1.211,66 TL
9 x 145,02 TL
1.305,17 TL
12 x 117,83 TL
1.413,93 TL
Taksit Tutarı
Toplam Tutar
3 x 376,93 TL
1.130,78 TL
6 x 201,94 TL
1.211,66 TL
9 x 145,02 TL
1.305,17 TL
12 x 117,83 TL
1.413,93 TL
Taksit Tutarı
Toplam Tutar
3 x 376,93 TL
1.130,78 TL
6 x 201,94 TL
1.211,66 TL
9 x 145,02 TL
1.305,17 TL
12 x 117,83 TL
1.413,93 TL
Taksit Tutarı
Toplam Tutar
3 x 376,93 TL
1.130,78 TL
6 x 201,94 TL
1.211,66 TL
9 x 145,02 TL
1.305,17 TL
12 x 117,83 TL
1.413,93 TL
Taksit Tutarı
Toplam Tutar
3 x 376,93 TL
1.130,78 TL
6 x 201,94 TL
1.211,66 TL
9 x 145,02 TL
1.305,17 TL
12 x 117,83 TL
1.413,93 TL
Taksit Tutarı
Toplam Tutar
3 x 376,93 TL
1.130,78 TL
6 x 201,94 TL
1.211,66 TL
9 x 145,02 TL
1.305,17 TL
12 x 117,83 TL
1.413,93 TL
Taksit Tutarı
Toplam Tutar
3 x 376,93 TL
1.130,78 TL
6 x 201,94 TL
1.211,66 TL
9 x 145,02 TL
1.305,17 TL
12 x 117,83 TL
1.413,93 TL
Taksit Tutarı
Toplam Tutar
3 x 376,93 TL
1.130,78 TL
6 x 201,94 TL
1.211,66 TL
9 x 145,02 TL
1.305,17 TL
12 x 117,83 TL
1.413,93 TL
Taksit Tutarı
Toplam Tutar
3 x 376,93 TL
1.130,78 TL
6 x 201,94 TL
1.211,66 TL
9 x 145,02 TL
1.305,17 TL
12 x 117,83 TL
1.413,93 TL
All our produced Lithium battery BMS, we guarantee 3 years warranty in quality, if the damageiscaused by human improper operation, we will conduct repair with charge
1. The BMS is a professional accessory. Many operating errors will result in product damage, so please follow the instructions manual or wiring video tutorial for compliance operation.
2. Strictly forbidden to reversely connect the B- and P- cables of the BMS,forbidden to confuse wiring.
3.Li-ion, LiFePO4 and LTO BMS are not universal and incompatible, mixed use is strictly prohibited.
4.BMS only be used on battery packs with the same strings.
5.It is strictly forbidden to use the BMS for over-current situation and unreasonably configure the BMS. Please consult customer service if you don't know how to choose the BMS correctly.
6. Standard BMS are prohibited from being used in series or in parallel connection. Please consult customer service for details if it is necessary to use in parallel or series connection.
7. Forbidden to disassemble the BMS without permission during use. The BMS does not enjoy the warranty policy after privately dismantling.
8. Our BMS has waterproof function. Because of these pins are metal, forbidden to soak in water to avoid oxidation damage.
9. Lithium battery pack needs to be equipped with dedicated lithium battery charger, other chargers cannot be mixed to avoid voltage instability etc. lead to the breakdown of the MOS tube.
10.Strictly forbidden to revise the special parameters of Smart BMS without permission. Pls contact customer service if you need to modify it. After-sales service cannot be provided if the BMS was be damaged or locked due to unauthorized parameters modification.
11. The use scenarios of the DALY BMS include: Electric two-wheeled bicycle, forklifts, tourist vehicles, E-tricycles, low speed Four-wheeler, RV energy storage, photovoltaic energy storage, home and outdoor energy storage and etc. If the BMS needs to be used in special conditions or purposes, as well as customized parameters or functions, please consult customer service in advance.
12. After receiving the prototype confirmation, please return it in time. There is no return and problemfeedbackwithin 7 days. Our default customer test is qualified;
13. The picture in the book is a general-purpose model picture, which may be different fromthe sample deliverymachine. This specification book reaches the final interpretation right of Lithium Electronics. 2. Before the customer batches, please sign and return in the specification, and explain the detailedfunctiondescription.
Attention Items
1.Lithium batery BMS with different voltage platform can not be used mutaully, eg., Life Po4BMScan not be used for Li-ion battery.
2.In utilization, please to make sure to Follow up the designed parameter and utilization conditions.
3.Charge and discharge current can not be higher than the quoted current value in specification.
4.Please to utilize the BMS in the the regulated working temperature range, and make sureofthewell heat dissipation environment.
5.No self taking off and change parts in BMS.
6.Our product has the function of waterproof, but still suggest avoid of long time water immersion.
7.We conduct Anode Oxidation process in BMS dissipation plate, but when the Oxidationlayerdestroid, it stll may electricity conductive, it is stll suggest to avoid Dissipation plate contact withCell and Nickel band.
8.If the protection board is abnormal, please stop using it, and then solve the problemanduseitagain;
9.Do not use two protective plates in series or in parallel.
How BMS Connect
1.The sequence of the protective board connection battery wiring:
Special attention: The wire cable of different manufacturers are not same standard, please make sure to use he- matching cables; the colors of B- and P- lines of different manufacturers are different, please pay attention to the B- and P- marks.
1. Remember!!! When welding sampling wire cable, do not insert the cable into the BMS.
2.The cable connects the total negative electrode B-from the fine black line. The second wire (red wire) is connected to the positive pole of the first string of batteries.Connect the positive electrode of each string of batteries in turn until the last wire cable of the total positive B+.

Daly 4S  12V 40A BMS

Over Discaharge Voltage Protection
Smart Short Circuit Protection System
Smart Balance Function  Bluetooth
Electric vehicle energy storage BMS
Over Charge Managable Protection

Plastic Injection Waterproof Patent
Daly Smar UART, RS485 and CAN
Sixth Generation active balance
BMS Voltage Range
BMS Current Range
BMS Cell Range

HS Code GTIP :8536300000

Dongguan Daly Electronics Co., Ltd. was established in 2015, integrating R & D, production and sales, and specilizing in the production of lithium battery protective boards, such as LiFePO4 BMS, NMC BMS, LTO BMS, which can be used to energy storage, electric vehicles, electric tools, electric wheelchairs, AGVs, and forklifts, etc. The specifications of Daly BMS are 3S - 32S, 12v-120v, and 5A-500A. Smart BMS, BT, UART, RS485, can, LCD and GPS are very popular in Europe, Asia and North America. We strive to continue to develop more high-tech BMS. Welcome to visit our company in person, and hope to establish a long-term cooperative relationship with you.

DALY BMS used for 18650, 32650, 21700, prismatic cells etc

1.Use top quality (A-level) protective integrated circuit IC, from the solution of Seiko of Japan.

2.Strong load ability, constant discharge current 25/35A/45A/60A/100A/120A/150A/200A , use high voltage resistance, low inner resistance power Mosfet. The heat sink will greatly help cooling.

3.IC itself has power balancing function. The circuit is simple and reliable.

4.Typical voltage detection for each cell. So each battery will be prevented over charged or over discharged. Over current and short circuit protection function is very reliable.Long time short circuit of the load won’t affect the PCB and the battery.Temperature protection during charging and discharging.

5.Extreme low power consumption. The consumption of the whole device is less than 50uA.

6.PCB use high anti-corrosion, high water resistance, high impedance ESD conformal Coatin The Daly Smart BMS provides all-round care for the lifepo4 battery and is worthy of your long-term use. Please see below for information on the Smart lifepo4 BMS for 4S,8S,16S, 20S, and 24S.

Fully Programmable Smart BMS with Bluetooth with Android or iPhone App.

The charge and discharge using the same port.

Protection functions : This BMS is designed with a high quality IC chip specially for lithium battery protection.

High detection precision degree on over-charge, over-discharge, voltage balancing.

Protection of over-discharge and over-current detections and delay times in detecting process. .

Protection against over-voltage when charging Low temperature charging protection a -1c.

BMS with Precise SOC calculation with SOC function with automatic learning. .

Automatically charge battery function or static balance function for the battery system.

Mobile phone software to manage the detecting the battery working status and some parameters setting over wireless bluetooth.

Intelligent communication, human-computer interaction

The Daly smart BMS has three communication functions of UART, RS485 and CAN, which can be connected to the PC SOFT, display screen, and mobile APP, to intelligently manage the lithium battery. If you have customized requirements of communication protocols such as mainstream inverters and Chinese tower protocol, we will provide high-quality customized services.


Daly has developed a mobile phone APP. After the Bluetooth is plunged into the BMS, the BMS can connect to mobile phone APP, which can monitor the battery data the relevant parameters in real time, such as battery voltage, total voltage, temperature, power, alarm information, charging Discharge switch, etc.

Daly “Smart” BMS

Only by realizing high-precision detection and high-sensitivity response to voltage and current, the BMS can achieve great protection for lithium batteries. Daly standard BMS adopts IC solution, with high-precision acquisition chip, sensitive circuit detection and independently written operation program, to achieve voltage accuracy within ±0.025V and short-circuit protection of 250~500us to ensure the efficient operation of the battery and easily handle complex solutions.

For main controlling chip, its flash capacity up to 256/512K. It has the advantages of chip integrated timer, CAN, ADC, SPI, I2C, USB, URAT and other peripheral functions, low power consumption, sleep shutdown and standby modes.

In Daly, we have 2 DAC with 12-bit and 1us conversion time (up to 16 input channels)

High-quality materials

Daly smart BMS adopts professional copper plate high-current design, high-quality components such as high-current copper plate and corrugated aluminum heat sink, to withstand the high current.

Support in-depth personalized customization services

Daly has been deeply involved in the BMS industry for many years, and has a variety of advantages to meet your individual needs. The R&D team implements a first-ask responsibility system to ensure that each individual demand is responded in a closed loop. 13 intelligent production lines, 20,000 square meters of anti-static workshop, with strong flexible manufacturing strength, Daly can ensure the quality and delivery speed of products.

Strong production capacity and timely delivery

Daly has an annual output of more than 10 million pieces of various types of BMS and has sufficient conventional inventory. Customized products can be quickly delivered within a limited period from customer orders to proofing, mass production, and final delivery. Customers in more than 130 countries and regions around the world have already enjoyed the professional, high-quality BMS solutions of Lithium.

What Is A LiFePO4 BMS?

A BMS is an integral part of any lithium-ion battery system — it’s responsible for keeping the cells within the battery pack healthy and performing optimally.

Every battery has a specified range of voltage, current, and temperature in which it can safely operate. If one or more of these parameters varies considerably from their specified range, your battery pack can get permanently damaged (due to degradation of its components) and even pose safety risks.

Most batteries come with a built-in BMS to prevent this from happening.

A LiFePO4 BMS controls the discharge and charge processes of LiFePO4 battery packs. So if anything goes wrong during these processes, the BMS protection immediately kicks in and adjusts the charging parameters or cuts off the power flowing to and from the battery pack entirely.

Moreover, a BMS monitors the battery cells and makes sure they’re all working together correctly. It also measures parameters like voltage, current, and temperature to ensure that the battery is healthy and safe.

This way, a BMS helps prevent your battery from:





-Cell Imbalance

-Shorter life cycle

Additionally, a BMS optimizes your battery capacity and overall performance in every charge/discharge process. This way, you can get the most out of your LiFePO4 battery pack regarding performance and lifespan.

LiFePO4 BMS Main Functions

1. Control operating conditions

Measures voltage, current, and temperature signals and controls these parameters to achieve cell balance and prevent damage to the battery.

2. Perform Diagnosis

Monitors cell-to-cell variations over time; diagnoses errors, detect safety risks, and sends warning signals to the driver (which can then initiate the proper measure to avoid this safety risk).

3. Collect and Store Data

Records the pack’s and the individual’s cell signals; stores data related to the battery’s life cycle history.

4. Estimate Parameters

Determines cell and pack levels such as State of Charge (SOC) and State of Health (SOH); communicates with controllers for cell balancing.

Types Of LiFePO4 BMS

You can find a LiFePO4 BMS in many different shapes and sizes, depending on the size of your LiFePO4 battery.

How Does A LiFePO4 BMS Work?

A LiFePO4 BMS consists of several hardware and software functional blocks programmed with functions that protect the battery pack by monitoring and controlling its charge and discharge conditions.

A good BMS should offer protection against:

Over and under-voltage

Over and undercurrent

Cell Imbalance

Over and under temperature

Cut-off Voltage And Current

Battery management systems have current-driven and voltage-driven cut-off transistors that can cut off the power from the charger to the battery or from the battery to the load. These transistors act as switches: when the cell voltage monitor detects a voltage higher than the system can handle, the switch is turned off, protecting the battery from overvoltage. 

The same applies to Undervoltage: when the voltage monitor detects a voltage lower than the minimum charging or discharging voltage, the cut-off transistor kicks in, stopping this charging voltage from reaching the battery, thus avoiding any damage to the battery pack.

Cell Balancing

Another primary function of a LiFePO4 BMS is ensuring that all cells in a pack are correctly balanced. Balanced cells mean that if you were to measure the voltage of each cell individually, you’d find the same value for every cell. This helps prevent the battery from charging/discharging erratically. Here’s how a BMS balances a battery pack: by changing the charging current for one or more individual cells in the pack, making it different from the pack current, in one of the following ways: Removing charge from the cell charged the most provides “space” for additional charging current to prevent overcharging and allows the less charged cells to receive more charging current. Redirecting the charging current (partially or entirely) to the less charged cells, allowing them to receive a charging current for an extended period until cell balance is reached.

Temperature Control

A temperature sensor sends the battery’s temperature signal to the BMS’s monitoring unit. If a potentially dangerous charging or discharging temperature is detected, the BMS automatically cuts off any power to and from the battery, preventing any safety risks related to over or under temperature.

Many protection strategies are programmed into a BMS; most are too complex to mention. However, they all have the same goal: to protect the battery from any possible extreme conditions related to voltage, current, temperature, short circuit, cell imbalance, etc. Using a BMS, you can maximize battery life and performance.

Can I Charge A LiFePO4 Battery Without A BMS?

Supplying a battery pack with a charging voltage or current higher than the recommended can lead to a thermal runaway, resulting in a fire or explosion. To prevent serious safety issues from occurring, if you choose to charge your LiFePO4 battery (or any battery), you should at least closely monitor the charging conditions such as voltage, current, and temperature. You can use voltage and amperage meters for this and a temperature sensor for your battery cells.

This way, you’ll know if your battery is under any stress and will be able to adjust the conditions accordingly. In addition, by not using a BMS, you’ll negatively affect your battery’s service life. This way, it won’t last as long as it would if it had a BMS to ensure optimized working conditions.

How Do I Choose The Correct BMS For A LiFePO4 Battery?

While LiFePO4 batteries offer significant advantages, they can be pretty expensive. For this reason, you might be considering making your DIY LiFePO4. If that’s the case, using the correct BMS for your LiFePO4 battery is crucial to ensuring your battery pack functions safely and correctly. Choosing the correct LiFePO4 BMS greatly depends on the size of your battery system, in particular its rated voltage and capacity. To better understand the requirements for choosing the correct BMS for your LiFePO4 battery pack, first review a few relevant battery properties like the voltage, amperage, capacity, and C-rating.


Voltage is the electrical potential difference between two points in a circuit (the unit for voltage is volts, V).

In other words, voltage is the force/pressure in which the current moves through an electrical circuit. 

A battery pack is an assembly of several cells. The number of cells (and their chemistry) in a battery pack will determine its nominal voltage.

Individual LiFePO4 cells have a nominal voltage of 3.2V. This way, connecting four LiFePO4 cells in series results in a battery pack with a 12.8V nominal voltage.


Amperage is a measure of electrical current flow. It is sometimes referred to as Amps, for short. It expresses the number of electrons passing through a certain point in a circuit at a given time. In other words, it is the rate at which electrons flow in a circuit.

Battery Capacity

Battery capacity is measured in amp-hours (mAh for small-scale batteries). It indicates the total amount of current a battery can supply over 1 hour until its voltage drops to a specific value for each type of battery (cut-off voltage).


The C-rate measures the discharge (or charge) rate of a battery relative to its rated capacity.A 1C rate means that the discharge current would discharge the entire battery in 1 hour. Therefore, for a battery rated at 100Ah, 1C rate means that it would provide 100A for one hour. Conversely, if its C-rate were 0.5C, it would deliver 50A for two hours.

How Do You Size Your BMS?

Your battery’s correct LiFePO4 BMS size should be a BMS compatible with your LiFePO4 specs. For instance, if you have a 12V battery pack, it should use a BMS rated for 12V.

More importantly, is the BMS amperage rating. To correctly size your LiFePO4 BMS, you need to estimate the maximum power (in Watts) that you will be drawing from your battery. Here’s why:

This is how you calculate power:

Power (W) = Voltage (V) x Amperage (A)

Let’s say you want to build a solar system with a 2000W inverter to power loads of up to 1800W. You’re considering getting a 100A BMS to connect to your 12V LiFePO4 battery pack for this system.

Therefore, if you draw a 100A from your 12V battery (which is the most your 100A BMS can safely handle), the maximum power you’ll get from your system is 1200W.

Power (W) = 12V x 100A = 1200W

With this system, you won’t be able to power any load over this 1200W limit, and your 100A BMS won’t be compatible with the 2000W solar system you wish to build.

However, if you use a 200A BMS, the maximum power output of your system becomes 2400W:

Power (W) = 12V x 200A = 2400W

Now you have a compatible BMS to your 2000W system.

Conversely, if your battery pack’s nominal voltage is higher than 12V, you’ll be able to draw a larger amount of power using a 100A BMS:

For a 24V battery pack: Power (W) = 24V x 100A = 2400W max power output

For a 48V battery pack: Power (W) = 48V x 100A = 4800W max power output

However, this 100A BMS will have to be rated for the same voltage as your battery system.

Another way of determining if a certain BMS will be able to handle your battery system is using the capacity and C-rate.

For example, if you have a battery pack with 200Ah of capacity and a maximum C-rate of 0.2C for a given load, then the BMS should be able to handle at least 40A because:

200Ah x 0.2C = 40A max, delivered for 5 hours

To summarize, choose a BMS with a continuous discharge current a bit larger than what you’ll be using your battery for and a charge current larger than you’ll be using to charge your battery. Always leave a bit of wiggle room for any unexpected situation.

In addition, make sure it is rated for your battery configuration: 4S for 4 cells (or packs of cells), 8S for 8 cells, 16S for 16 cells, etc. This is also reflected by the number of sampling wires that connect your BMS to your battery (there should be a wire for each cell). Here’s an image showing these sampling wires:

Finally, make sure your LiFePO4 BMS comes with all the features you wish to have, like cell balancing, shockproof case, Bluetooth module to control and program via the app, etc.

The BMS is a crucial component of battery systems — it monitors the battery cells and makes sure they’re all functioning together properly within the battery pack.

It also measures charging and discharging parameters like voltage, current, and temperature to ensure that your battery is working correctly and safely.

If any of the cells start to malfunction, the BMS will take action to correct the problem, which may include shutting down the battery system entirely.

For this reason, choosing the correct BMS will significantly impact your battery pack’s life cycle and overall performance.

BMS Electrical Specification
BMS Type LiFePo4
BMS Number of Serial Cell 4s
BMS Discharge Current Amper 40
BMS System Voltage 12
BMS Max DesCharge Current Amper 120
BMS Charge Voltage Max 14.6
Inner Resistance 20mΩ
BMS Charge Current Amper 20
BMS Charge Cut Voltage 3.65
BMS Over Charge Coltage 3.75
BMS Over Charge Protection 1sn
BMS Balance Detect Voltage 3.5V
BMS Balance Current mA 30
BMS Over Discharge Voltage 2.7
BMS Over Discharge Delay 1sn
BMS Short Circuit Detect Delay 250µS
BMS Self ConsuptionCurrent 100µA
BMS Sleeping consuption Current 20µA
BMS Communication
BMS Bluetooth No
BMS Supported Inverter Goodwe, Growatt, Deye, Sofar, Srne, Pylon, Victron Energy, Voltronic Power, Sma, Must.
BMS Mechanical Specification
BMS Operation Temperature -20ºC~60ºC
BMS Dimension 75mmx48mmx9mm
BMS Weight gr 156
BMS Standarts
BMS Certificate ISO 19001 EN 55032-2015, EN 55024:2010/A1:2015/EN61000-3-2:2014/EN 61000-3-3:2013/

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