lithium bms PCB-4S4A-02 3s 4s 3a 4a

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    US $1.70
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Quick Details
Place of Origin:
Guangdong, China (Mainland)
Brand Name:
Model Number:
Base Material:
Copper Thickness:
Board Thickness:
Min. Hole Size:
Min. Line Width:
Min. Line Spacing:
Surface Finishing:
HASL Lead Free
Product name:
standy power supplier bms li ion 30a
lithium/lifepo4 battery BMS
Lithium Battery Packs,LiFePO4 etc
Digital Equipment, Power Bank,Power tool,Electrice Vehicle
Solder mask:
Green. Red. Blue. White. Black.Yellow
Number of layer:
double or Multilayer
FR4 /aluminum/ceramic CEM1, CEM3 Rogers Etc
Delivery time:
7-15 days after payment for small order
Supply Ability
Supply Ability:
100000 Piece/Pieces per Month
Packaging & Delivery
Packaging Details
Inner packing:Vaccum packing/Plastic bag.
Outer packing:Standard carton packing or packing per customer's requirements.
Lead Time :
Shiped within 7-15 days after payment

lithium battery management system pcb pcm board 3s 4s 12v standy power supplier bms li ion 4a with balance function


1.True lithum battery pack BMS factory

2.Supply OEM/ODM and custom service

3.High quality with smart balance function

4.Wholesale price


5.ISO9001/ISO14001/CE/ROHS certificates

6.Fast delivery


 About the battery BMS


Function: Detect and protect the battery from over-charge  ,over-dicharge, over-current short-circuit

  ,temperature detecting protection  and auotmatically voltage balance function .

Build with high end electronic components (High End IC and MOSFET ) ,simple structure
design will let it have more stable quality working performance , Flexible application ( it can be used for less
series battery by leaving some connection pins at empty status ),full set of protection measures let it works well
without any infulence from external unexpected accidents.


About your products,just tell us the relative voltage/ cells/ current A or equipment etc,

we will help to recomment the most suitable products for you. or we design for you!

Product Description



zhen Li-ion Battery Bodyguard Technology Co.,LTD
PCM Specifications  For 14.8V(4S)Li-ion Battery Packs
No.Test   itemCriterion
1VoltageCharging voltageDC:16.8V  CC/CV
Balance voltage for single cell 
2CurrentBalance current for single cell 
Current consumption ≤50μA
Maximal continuous charging current4A
Maximal continuous Discharging current4A
3Over charge ProtectionOver charge detection voltage for single cell4.35V±0.025V
Over charge detection delay time0.5S—1.5S
Over charge release voltage for single cell4.15V±0.05V
4Over discharge protectionOver discharge detection voltage for single cell2.40V±0.08V
Over discharge detection delay time0.5S—1.5S
Over discharge release voltage for single cell3.0±0.10V
5Over current protectionOver current detection voltage200±25mv
Over current detection current10 ±1A
Detection delay time  5mS—15mS
Release conditioncut load
6Short protectionDetection conditionExterior short circuit
Detection delay time200-500us
Release conditioncut load
7ResistanceProtection  circuitry(MOSFET)≤50mΩ
8TemperatureOperating Temperature Range-40~+85℃
Storage Temperature Range-40~+125℃
Company Information


Shenzhen Li-ion Battery Bodyguard Technology Co.,Ltd. is a collection of digital (single class), multi-cell power

BMS lithium battery protection board the R & D, production, sales and service of high-tech enterprises. The factory

was set up in the Industrial Zone, LongHua San Wei Third Industrial Zone,  a beautiful environment, convenient

transportation, welcome new and old customers come to visit.

The company has developed a multi-string lithium battery pack protection board, power lithium battery packs

balanced protection board and LiFePO4 battery pack the balanced protection board nearly models, product

specifications covering the battery assembly in series 2-24 string, working current up to 100A protection of the

battery management system, the company's complete product specifications can also be customized according

tocustomer requirements.

 The company's products are widely used in mobile phone batteries, laptop battery, Tablet PC battery, power tools

battery, batteries for electric bikes, electric bus battery, golf cart batteries, and other digital products, spare power

supply, etc., product market involves digital products, power in areas such as automotive, energy storage devices

,medical equipment and mobile lighting.

Our customers


We have cooperated with HP,Emerson tool,NIke,WD.




Return policy

We guarantee the product  from us with a 12 months warranty against defects in quality, but we are not respon

sible for buyers' mistake or wrong handling, our product must be maintained in proper way. If Item is defective

and not working on arrival, please report the item to us within 7 days of receiving the defective product so we

can issue a RMA. 

 Please contact us to request a return authorization. Please include your name, auction number, and reason for 

return when you contact us. All items returned must contain all original packaging materials. Please carefully

repack the item.Items returned will be tested and if found defective, the buyer will be shipped a new replacement

unit immediately. In the event that a suitable replacement is not available a refund will be issued. 

The return shipment cost should be afforded by buyer if you can not accept our policy  ,please do not buy the item

from us ,fair deal is importable for both of us .


 Q: How do I judge what material my battery is ?

A: Please take a look at the battery body.if the normal voltage of your battery shows as 3.2V,the battery will be

LiFePo4.If the normal voltage of your battery shows as 3.6V or 3.7V, the battery will be Li-ion or Li-polymer battery. you

can also ask battery manufacturer the material of battery.

Q: Can I use this protection circuit board for my battery?

A: Can use this protection circuit board, or not? There are 2 questions:How much cells in series is your battery

pack? The protection circuit board you need to buy must be same cells in series as your battery pack.What material

is your battery? Only the LiFePo4 battery has different electric parameter from other battery, so if you need buy the

protection circuit board for LiFePo4 battery , Please let us know firstly.


Q: Do we need cell balance or not?

A: The function of balance : Since battery is made of many pcs of cells in parallel and in series, the cells can't be

the same as no two people in the world is the same , so can only put in group with similar performance is not

consistent , which will lead to each cell voltage is not consistent as well after the completion of the charging if

without balance fun


Q: Do you have Minimum Order Requirement (MOQ)?

A: No, We don’t have MOQ, Different customer have different requirement ,We can provide various capacity and size

is per your requirements,Also ODM / OEM is welcome.

Q: What is your term of payment?

A: PayPal, T/T, L/C,Western Union