3-32S smart LIFEPO4 li-ion BMS with RS485 UART dual communication

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$30.00 - $35.00 / Piece | 10 Piece/Pieces (Min. Order)
Lead Time:
Quantity(Pieces) 1 - 1000 >1000
Est. Time(days) 10 Negotiable
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Quick Details
Place of Origin:
Guangdong, China
Brand Name:
Model Number:
7s 30a
Base Material:
Glass fiber
Copper Thickness:
Board Thickness:
Min. Hole Size:
Min. Line Width:
Min. Line Spacing:
Surface Finishing:
7S 29.4V
discharge current:
30A 40A 50A
Common port:
temperature sensor:
with balance:
10 pieces
Electric Bicycle
Supply Ability
Supply Ability:
1000000 Piece/Pieces per Month
Packaging & Delivery
Packaging Details
1pc per opp bag,safe carton pack
Lead Time :
Quantity(Pieces) 1 - 1000 >1000
Est. Time(days) 10 To be negotiated

 7S 29.4V 20A 30A 40A smart BMS with UART/RS485 connect 7s lithium ion bms with BT


What BT Communication Module can do ?

With BT Communication Module , the APP Software can be connected , and all information of the BMS can display on your Mobile Phone .  and you can set some parameters on Your APP software :Over-protection voltage , Over-discharge protection voltage ,Rlease voltage of over-charge and discharge


Adjustable BMS can set up Voltage and Current


You could get the SOC, RM, RSOC, Voltage, Current, Temperature of battery pack through UART connect

Please contact with us for more information

BT module is 6USD per pcs ,UART tool box is 8USD per pcs



Discharge current 20A 30A  40A
Over discharge current protection 30A 40A 50A
MOSFET ≤10mΩ ≤10mΩ ≤10mΩ
Charge current 10A 20A 30A
Charging Voltage 29.4V 29.4V 29.4V


Over charge protection Balance Voltage
Dection Voltage:  4.25±0.03V Dection Voltage:≥4.0V
Detection Delay Time:1000mS Release Voltage:<4.0V
Release Voltage:4.15±0.025V Balance Current: 50~60mA


Over Discharge Voltage Protection Over Discharge Current Protection
Dection Voltage:  2.7±0.1V Dection Voltage:150mV
Detection Delay Time:1000mS Detection Delay Time:5mS
Release Voltage:2.9±0.1V Release Condition: Disconnect load/Charge activation





Warning :

1,Should strictly follow the connection step as the diagram. 

2,Double check the connection is correct,then connect it to the battery pack "+","-" Pin.

3,We are not responsible for the defectives caused by wrong connection.


Related Products


1.What is the common port and separate port? what is the difference?
We take 13S48V15A BMS as an example, common port 15A means your charge cathode and discharge cathode are connected in the same point end(our P-), charge cathode and discharge cathode are used in the common connection 
port, so the charge current and discharge current are the same 15A. while the separate port is separately connected by charge cathode (C-) and discharge cathode (P-),  so the charge current and discharge current are different, discharge current 16A, charge current 8A.
2.What is the balance function?
The working principle and function are as followings, when your one cell voltage is upto alarm voltage(Li-ion upto 4.18V, Life Po4 upto (3.6V), then the cell Balance starts to work, balance resistance starts discharge with 35ma(when balance discharge starts to work, BMS will starts a little heat up, which is the normal reflection), the cell is in both charging and discharging status, and others which are not reached to alarm voltage(Li-ion 4.18V, Life Po43.6V)are only in charging status, no discharging, when the fast cell voltage is reached to alarm voltage(Li-ion 4.25V, Life Po43.75V)BMS starts off power protection, all the other cells 
are all in stop of charging, this process will enable your battery charging in balance current, and your battery voltage are in balance status, but when your cell voltage difference are in a big range, then balance can not be functionning.
3.The relationship between Battery capacity and BMS current?
There is no direct relationship between  Battery capacity and BMS current, big capacity doesn`t mean a big battery, but rely on continue current, that is to say if your engine is powerful, your should choose high current of BMS, it is not relied on battery capacity.
4. What type of charger should  I choose?
Lithium battery must choose specific charger, do not use Charger for Leadacid battery, for leadacid charger may have MOS with high pressure breakdown protection, which will not protect of BMS over charge.Life Po4 battery charger voltage=battery string No.X3.6V, while Li-ion battery charger voltage=Battery string No.X4.2V.
5. What current BMS should I choose ?
Take 10S36V as an example: what current BMS you choose is relied on your E-bicycle Motor power and current limitation of controller. eg., choose 16A for below 350W, 25A for below500W, 35A for below 800W, 60A for Below 1000W, higher than 1200W are contact with our service specialist for suggestions, one inall, continue current shall be higher than current limitation in Controller.
6. Whether my BMS damaged?
if you want to judge if the BMS is damaged, please take the folowing steps, to test if each cell voltage is the same with voltmeter? if the cell voltage difference is over 1.0V, the fault is displayed that it cannot run far, no power supply at the 
start range, short charge time, all these issues are almost caused by battery cells, if BMS damaged is displyed as no charge, no discharge, no discharge while the battery has voltage.