Send Message

4 Cells 14.4V Li-Ion BMS Battery Management System

Product Details:
Place of Origin: CHINA, guangdong
Brand Name: RYDBATT
Certification: IE ROHS
Model Number: RYD-4S-072-V3.0 2021-03-11
Payment & Shipping Terms:
Minimum Order Quantity: Negotiable
Price: Negotiated The Price
Packaging Details: Customer requirements
Delivery Time: 30-45 work days
Payment Terms: D/P, T/T,
Supply Ability: 2000PCS /Day
Specifications Product Description Request A Quote
Name: BMS
Certificate: IE ROHS
Type: BMS Board
High Light:

li ion bms


lithium ion bms

Product Description

PCB For 4 Cells Bms Battery Management System 14.4V Li-Ion Li-Polymer Lithium Battery For Electric Tool


Battery Management System (BMS)
You'll need a BMS to monitor your cells during charging and discharging. Basically it protects the cells from getting drained too far or getting overcharged. When choosing a BMS you need to match two main factors: voltage and current rate (more important for discharge than charge current). If you are building a 36V battery, you'll need a 36V BMS (or usually called 10s, meaning 10 cells in series) to match your battery. A 48V battery uses a 13s BMS and a 52V battery uses a 14s BMS. Just make sure you choose a BMS configured for the same amount of cells as the battery you are building. Also remember to check the discharge current. If you want your battery to be able to handle 20A continuously, choose a BMS that is rated at least 20A, and higher is better to give you a safety buffer.



(Product specifications)


cells 4S
type Lithium 18650


● The protection board is for 4S lithium batteries, it can be used for Li-ion/Li-polymer batteries
● Stable various protective functions for charging and discharging, such as accurate overcharge protection, over-discharge protection, over current protection and short circuit protection


4 Cells 14.4V Li-Ion BMS Battery Management System 0


Features and Benefits

  • Apply for 4 cells li-ion / li-polymer batery pack protection
  • Internally trimmed charge and discharge voltage limits
  • Discharge current limit detection
  • Low current standby mode when cells are discharged
  • High quality and high yield: 100% tested before shipment
  • Dimension: 50 x 16 x 3.5 mm
  • Compatible with both Li-ion and Li-Polymer cells


Item Content Criteria
Over Charge Protection Over Charge Detection Voltage 4.25±0.025V
Over Charge Release Voltage 4.15±0.05V
Over Discharge Protection Over Discharge Detection Voltage 2.5±0.08V
Over Discharge Release Voltage 3.0±0.1V
Rated Operational Current ≤6A
Over Current Protection Over Current Detection Current 17±4A
Release Condition Cut Load
Detection Delay Time 5~15ms
Short Circuit Protection Detection Condition Exterior Short Circuit
Release Condition Cut Short Circuit
Interior Resistance Main Loop Electrify Resistance RSS≤60mΩ
Current Consumption Current Consumed in normal Operation 50μA Max
Dimension 50 x 16 x 3.5 mm



B+:Connected to the fourth battery’s positive terminal
B3+:Connected to the third battery’s positive terminal
B2+:Connected to the second battery’s positive terminal
B1+:Connected to the first battery’s positive terminal
B-:Connected to the first battery’s negative terminal
P+:Connected to the battery’s output or the charger’s positive terminal
P-:Connected to the battery’s output or the charger’s negative terminal

Usage and Attention:

  • After purchasing the protection mold, users should connect lines in compliance with the instruction. Voltage usually exists in the battery, so operators should peel one line and then connect another starting from B-. Lines should be connected from the low position to the high position with no mistake of order, or the irreparable damage could be caused.
  • When lines get connected, bits of copper and tin should not cling to the guard shield.
  • Protection board should be connected to battery group with compliance to specifications and any leading line should not be put on the back of the board but on the lateral side.
  • When equipping the guard shield, hard epoxy sheer should be fixed on the back of the board as the barrier to prevent the squeezing against short circuit.
  • When welding output lines, power supply line with the proper diameter should be chosen to prevent great temperature rising and great dropping of line voltage while high current discharges.
  • The guard shield is usually fixed in the battery box, insulation, heat relief and tightness should be greatly concerned, or the internal short circuit could lead to some danger.
  • The full-charged battery group should be put properly out of children touch.
  • If any unusual condition appears during the using process, please stop using the product immediately.


About company:


* Ryder has 15 years experience of battery packs. Our customers are from all over the world.

* Develop products according to customer requirements or product orientation.

* The automated battery assembly line can process 7K-10K cells every day to guarantee fast delivery for the orders.

* Offer 200 test points for the battery within 60V 10A and 32 test points for the battery within 100V 20A.

* SAP & MES dual system to coordinate daily production.


Delivery Time:


- Material Preparation Time: 7-15 days (or inventory)

- Production & Assembly Time 3-10 days

- Testing & Packaging Time: 2-10 days

- Total Delivery Time: 30-45days

- The faster delivery could be negotiable.


Factory photo:


4 Cells 14.4V Li-Ion BMS Battery Management System 1

Contact with our sales team for your OEM and ODM order.


OEM/ODM Service:

If you want to display your own brand logo in products, bags, labels or anywhere. Or you need to develop battery packs according to your product orientation. Our OEM and ODM services are ready to do it.



According to Stardard Export Packing.

Carton box, wooden box, wooden pallet


Ryder Electronics established in Shenzhen on July 18, 2005, mainly in the business of battery packs. In 2009 the company passed ISO9001 and improved the product quality standard to fulfill the high-end requirements from our customers.


In 2012, Ryder Electronics moved to a new facility and expend the production capacity, the Productivity improved nearly 10 times than before.


In 2013, Ryder Electronics imported ERP (SAP) system to supervise order execution process.


In 2017, Ryder Electronics expanded the SMT, imported high-speed patch machine from Germany.


Until now the factory grows into a modern enterprise which integrated injection molding, PCB designing, SMT and battery pack assembling services.


In 2018 the company passed ISO14001certification, introduced automated battery production line to further improve the production quality and capacity.




Recommended Products
Get in touch with us
Contact Person : Miss. Vera
Tel : +86 13714601357
Fax : 86-755-32903781
Characters Remaining(20/3000)