2 PCS a lot 3S 20A LiFePO4 BMS/PCM/PCB battery protection board for 3 Packs 18650 lifepo4 Battery Cell
Here I urged buyers again that you need to match the battery capacity, battery internal resistance and voltage at the same level. Need good consistency, or it will lead to can&39;t charge or not full charge battery or other problems in the discharge.
About why many buyers said after change it, it will not be able to charge the battery, that is our board without balanced discharge resistance.
If one series battery voltage is higher than other tends to stop charging or can&39;t completely discharge, as for the bms with discharge balanced resistance protection plate ,it can recharge, but also can accelerate the aging cells, that effect is not good for batteries more.
So our bms is for more professional personnel to use, if the buyer cannot match the cells,it is not recommended to buy or choose original brand new battery.
Please note: in terms of battery matching need pairs of battery internal resistance differs within 5 milliohm, voltage within 0.03 V voltage, capacity vary within 50 ma, otherwise make the battery is not good. If there is no equipment test combination of lithium battery, please directly buy big brand new battery.
over discharge: 2V
over charge: 3.6V
continous current: 20A
over current: 120A
size: 64mm*32mm*4mm
application: high powe led, electronic tools, electronic sprayer, high power audio.
if your application is high power, please use power battery power battery can support 20A discharge.
![3](https://ae01.alicdn.com/kf/HTB1WiqgNpXXXXcwXXXXq6xXFXXXh/224459592/HTB1WiqgNpXXXXcwXXXXq6xXFXXXh.jpg?size=117685&height=600&width=600&hash=fcfcae4f3da515c5624aab0ba3e49980/)
3S/20A wiring diagram
B3+ charge/discharge positive
P- charge/discharge negative
![3s15a](https://ae01.alicdn.com/kf/HTB19YQeMVXXXXXkXVXXq6xXFXXX5/224459592/HTB19YQeMVXXXXXkXVXXq6xXFXXX5.jpg?size=212236&height=1008&width=1000&hash=a5bdf60e7db64460264f4206aaedbf7a/)
if you want balance function, you can buy our balance board,
( balance board) + ( PCM without balance ) = ( PCM with balance function)
with balance board wiring diagram
![3S_with_balance](https://ae01.alicdn.com/kf/HTB17MpMOpXXXXX0XFXXq6xXFXXXh/224459592/HTB17MpMOpXXXXX0XFXXq6xXFXXXh.jpg?size=118132&height=497&width=1000&hash=4c76a9b88bab86f4c81c039cdef6ee55/)
this BMS can use as 4S
![1](https://ae01.alicdn.com/kf/HTB1C5ogMVXXXXcNXFXXq6xXFXXXq/224459592/HTB1C5ogMVXXXXcNXFXXq6xXFXXXq.jpg?size=173772&height=624&width=750&hash=35361995388eb6a245f18e483b38e52c/)
4S/20A wiring diagram
P+ charge/discharge positive
P- charge/discharge negative
![wiring](https://ae01.alicdn.com/kf/HTB1SJXYNXXXXXataFXXq6xXFXXX9/224459592/HTB1SJXYNXXXXXataFXXq6xXFXXX9.jpg?size=74358&height=354&width=800&hash=336a30bd9d108c5ccf32a6e8d49aef53/)
if you want balance function, you can buy our balance board,
( balance board) + ( PCM without balance ) = ( PCM with balance function)
with balance board wiring diagram
Mass production, factory price
![26](https://ae01.alicdn.com/kf/HTB1XqefLXXXXXb0apXXq6xXFXXXD/224459592/HTB1XqefLXXXXXb0apXXq6xXFXXXD.jpg?size=178536&height=492&width=600&hash=c736e83d640b6ce4683465825378ebff/)
SMT Workshop:
![27](https://ae01.alicdn.com/kf/HTB1bbGALXXXXXbXXFXXq6xXFXXXK/224459592/HTB1bbGALXXXXXbXXFXXq6xXFXXXK.jpg?size=47120&height=375&width=500&hash=b9742010ed447246f39f0377c154a45e/)