2 PCS a lot 3S 20A lipo lithium Polymer BMS/PCM/PCB battery protection board for 3 Packs 18650 Li-ion Battery Cell
2016 New Upgrade 3S 4S BMS --- Same price,more better quality
This BMS has over-charge,over-discharge,short cut functions. As to the over-current function, the current is large so it can ignore it . Our main aim is to used for large current equipments like electronic motors. it is used for li-ion 3.7V battery cells
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: 2.5V
over charge: 4.25V
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.
3S/20A wiring diagram.
B3 charge/discharge positive
P- charge/discharge negative
B- battery negative end
B1 connect the point between battery 1 and battery 2
B2 connect the point between battery 2 and battery 3
B3 battery positive end
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
This PCM can use as 3S/20A, also can use as 4S/20A
4S Wire connections
P+ charge/discharge positive
P- charge/discharge negative
B- battery negative end
B1 connect the point between battery 1 and battery 2
B2 connect the point between battery 2 and battery 3
B3 connect the point between battery 3 and battery 4
P+ battery positive end
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
SMT Workshop: