Product Description
Arbitrary Parallel ConnectionArbitrary Parallel Connection
Small but Powerful
Supercharge Your Lithium
K/M/S Series
3~24S | 40~500A
Solid Materials Powerful Performance | Waterproof, Shockproof, Anti-oxidation Longer Service Life |
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Smart Communication Easy Connection with Mobile APP | Arbitrary Parallel Connection Lower Temperature Rise Safe Capacity Expansion Strong Overcurrent Capability |
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Note: The size/waterproof display above uses the Little Red Board 60A as an example;
the disassembly display uses the Little Red Board 500A as an example.
Slim Profile, Flexible Installation
123mm X 65mm X 14mm
Total Length X Total Width X Total Thickness
Little Red Board,
Big Capabilities
Smaller Size
More Energy
Compared to conventional 40~500A BMS, volume reduced by "40%"
Gives up more Space, more Energy, more Flexibility for the PACK cells
K Series ： 123mm × 66mm × 14mm
M Series ： 164mm × 66mm × 21mm
S Series ： 183mm × 108mm × 26mm
Patent Waterproofing,Pretty Impressive.
Industry-first *Glue Injection Process
Waterproof, Shockproof, Anti-oxidation, undaunted by water splashes.
Illustrated with K Series as an example
Cooling Main Control High-Speed
Aluminum Alloy MCU Fan
Thermally Conductive MOS Cooling
ABS Glue Injection Aluminum Alloy
Solid Materials,Pretty Impressive.
Precision Manufacturing, Solid Components,
Battery Protection Taken to the "Next Level".
*Illustrated with S Series as an example
Mobile APP
Multi-dimensional Intelligence,
At Your Fingertips
Smart Control, Easy Peasy
Connect to the mobile APP via Bluetooth to view/set parameters in real-time, remaining capacity, voltage, current, temperature, and other information at a glance.
Expandable with WIFI module to connect to the mobile APP for remote monitoring.
PC Software: More Engineering Settings
Connect to the PC software via communication cable (UART),
Offering more comprehensive functions and setting calibration capabilities.
Functional Features
Smart Cloud Platform
Efficient Remote Management
Expand with WIFI module or GPS module, you can log in to the Cloud Platform for remote batch intelligent management of lithium batteries.
Lithium battery data is stored in the cloud, supports multi-level sub-accounts.
You can also remotely upgrade the BMS firmwarevia the APP + Cloud Platform.
BMS+4G/WiFi/Bluetooth Module
Base Station 4G Network WiFi Router Mobile APP
Cloud Server
Cloud Platform
WIFI Module GPS Module
(Optional） (Optional)
Multi-channel Communication,
Multi-dimensional Expansion.
Note: Illustrated with K Series as an example,
M/S Series have the same functions
Dual UART communication interfaces,
Optional display, heating module, WIFI module, GPS
and other rich expansion applications.
Multiple Protections Combined,
Safeguarding with Ease.
Note: The following 4 functions are illustrated with K Series as an example,
M/S Series have the same functions.
Arbitrary Parallel Connection
Safe Battery Pack Expansion
BMS integrates parallel protection function
Prevents high current surge
when connecting in parallel.
100mA Passive Balancing
Extends Lithium Battery Life
Compared to the 30mA passive balancing of conventional BMS,
Balancing efficiency is increased by more than 3 times.
Temperature Protection
Avoids Safety Hazards
Early temperature warning, timely power-off,
Effectively prevents risks like battery fire.
Pre-charge Power-on
Easy Load Start-up
High-power pre-charge power-on,
effectively avoids false protection triggering
caused by high inrush current at start-up.
Robust Basic Protection,
Making Lithium Batteries, Pretty Impressive.
Comprehensively safeguards lithium battery safety,
With the battery well protected,
You travel with confidence.
Overcharge Protection; Overdischarge Protection; Overcurrent Protection;
Short Circuit Protection;Waterproof Protection; Shockproof Protection;
Temperature Control Protection; ESD Protection;
Hardware Technology，Solid Strength.
High Precision
Higher-end chips,
More precise control.
10~500uS Short Circuit Protection
±10~15mV Voltage Detection Accuracy
<5% SOC Error
Low Energy Consumption Low Temperature Rise
Saves battery energy Powerful thermal conductivity process
Strives for every bit of energy saving. Strong overcurrent capability.
Operating Current <15mA
Sleep Current <550uA
Meticulous Details,
Everything You Need.
*Function display uses K Series as an example,
M/S Series have the same functions.
Large Memory Capacity
400 entries (512KB) Massive Storage
4GB Customizable Large Memory
Massively stores 400 entries (512KB) of history information,
including protection times, current total voltage, current,
temperature, SOC, etc. 4GB super-large memory
can also be customized.
Snap-on Connectors Status Indicator Light*
Both harness and communication wires use Bright LED light, real-time display
Snap-on connectors for a tight connection of the four BMS working states.
Not easy to fall off, stable communication.
Working Condition 1: Shutdown, power failure, sleep: light off.
Working Condition 2: Working, discharging status: light flashes, on for 0.5s, off for 2.5s, 3s per cycle.
Working Condition 3: Working, charging status: light flashes, on for 0.5s, off for 0.5s, 1s per cycle.
Working Condition 4: Working, no charging/discharging: light flashes, on for 0.5s, off for 9.5s, 10s per cycle.
Product parameters
Series | K Series40~100A | M Series150~200A | S Series250~500A |
Current Range | 40A/60A/100A | 150A/200A | 250A/300A/400A/500A |
Dimensions | 123*66*14mm | 164*66*21mm | 183*108*26mm |
B-P- | 40/60A:10AWG 100mm | 4AWG 150mm | 250A:2AWG*1 300A:4AWG*2 |
Harness Specification | 24AWG 300~450mm(Subject to actual items) | ||
Rated discharge voltage (V) | Li-ion:N(Battery string)*4.2V | ||||||||
Series | K Series | M Series | S Series | ||||||
40 | 60 | 100 | 150 | 200 | 250 | 300 | 400 | 500 | |
Discharge overcurrent protection value (A) | 60 | 90 | 150 | 225 | 300 | 375 | 450 | 600 | 750 |
Charging current (A) | 40 | 60 | 100 | 150 | 200 | 250 | 300 | 400 | 500 |
Charge overcurrent protection value (A) | 60 | 90 | 150 | 225 | 300 | 375 | 450 | 600 | 750 |
Main circuit on-resistance (mΩ) | <20 | ||||||||
Passive equalization function (100±30mA) | Short circuit protection | ||
Equalization turn-on voltage (V): | Li-ion:4.0 LiFePO4:3.4 (Can be set up) | Short circuit protection conditions: | External load short circuit |
Equalize opening differential pressure (mV): | 20 (Can be set up) | Short circuit protection delay(uS): | 10~500 The actual test is subject to the customer’s battery sent back to our company for testing |
Balance current (mA): | Li-ion:100±15 LiFePO4:100±30 | Short circuit protection released: | Remove load release |
Single Cell over-charge protection | Single Cell over-discharge protection | ||
Protection voltage(V): | Li-ion:4.25±0.05 LiFePO4:3.75±0.05 (Can be set up) | Protection voltage(V): | Li-ion:2.7±0.05 LiFePO4:2.2±0.05 (Can be set up) |
Protection delay(S): | 1±0.8 | Protection delay(S): | 1±0.8 |
Recovery voltage(V): | Li-ion:4.15±0.05 LiFePO4:3.65±0.05 | Recovery voltage(V): | Li-ion:2.8±0.05 LiFePO4:2.3±0.05 |
Charge/discharge over-current protection | Temperature protection(°C) | ||
Protection delay(S): | 1±0.8 | Operating temperature(°C): | charging:-35~75 discharge:-35~75 (Can be set up) |
Release condition: | Removing the load is lifted | Storage temperature(°C): | -40~85 |
Current consumption Working current(mA):<15 Resting current(uA):<500 Sleep time(S):3600 | |||
*The above data is the temperature test results of laboratory,for reference only.
If you need customized services,please consult customer service for details
Structure Appearance,Size,etc. | Hardware NTC,Power display board,Soft Switch,Internal storage,Buzzer. | Software Mobile phone APP,PC software,communication protocol,etc. |
Application
Small Body,Big Uses.
Powerful Performance, Convenient Energy Storage
Safe and Reliable, Powering Your Lithium Journey.
3~24S
12~72V
40~500A
Ternary Lithium / LiFePO4
Electric Bicycle Motorcycle Electric Tricycle Power Bank AGV
Cleaning Vehicle Golf Cart Electric Forklift RV Energy Storage Aerial Work Platform
Installation and Wiring
Easy Installation in a Few Steps.
Wiring diagram uses K Series as an example, same for M/S Series
BMS Wiring
1. First connect the BMS B- wire to the battery pack total negative.
2. For the harness, start by connecting the thin black wire to B-. The 2nd wire connects to the positive of the 1st cell.Then connect subsequent wires to the positive of each cell in order. Finally, insert the harness into the BMS. Connect B+ to the positive of the last cell.
3. After wiring is complete, observe if the green indicator light works. Connect via Bluetooth APP or PC software to check for fault alarms. Measure the battery B+, B- voltage and the P+, P- voltage to see if they are the same. If they are the same, the BMS is working normally. Otherwise, repeat the steps above.
Disassembling the BMS
First, disconnect the load power switch and unplug the harness (if there are two harnesses, unplug the high-voltage harness first, then the low-voltage harness). Then disconnect P-. Finally, disconnect the power wire B-.
Motor , etc. Sampling cable Load
Total positive terminal B+ Charger
Last string
Third string
Battery pack
Second string
First string
Total negative terminal B-
Accessories
Original Accessories，Superior Quality
RS485 Cable UART Cable WIFI Module Bluetooth Module Round Power
Indicator Light Board
CAN Box Active Balancing Square Power 3-inch 4.3-inch
Module Indicator Light Board Display Screen Touch Screen
Packing List
| ① Box ② BMS ③ B-P- Output Wire (Gift) ④Manual ⑤ Output Wire Screws ⑥Bluetooth Module (Gift) ⑦Harness Note: The packing list uses the K Series 17S BMS as an example, same for M/S Series. |
Factory Strength
Deep Technological Accumulation
We consistently adhere to technological innovation as our core driving force, possessing eight R&D centers and bringing together over 100 R&D engineers from the fields of electronics, software, communications, structure, application, quality control, process, and materials. We have successively obtained nearly 100 patented technologies, including waterproof injection molding and high thermal conductivity control boards.
Strong Production Capacity
We have a 20,000m² intelligent production base with an annual output of over 10 million protection boards of various types, and a daily capacity of up to 30,000 units, ensuring timely product supply.
| Over 500 skilled workers | 13 automated production lines |
| 20,000 square meter anti-static workshop | 10,000,000+ protection boards produced annually |
Purchase Notes
1. Q: About Warranty
A: Under normal use, the product is covered by a one-year free warranty from the date of purchase. Return shipping costs are the responsibility of the customer.
2. Q: About Product Data
A: All product data, images, and statistical text in this store are derived from internal company test measurement results or reports and are for reference only. The actual product shall prevail.
