PCM-S4A30B 12.8V 30A Balance & Temperature Functions

Protection Circuit Module (PCM)  with Balance Function &Temperature Protection Function for Li-Ion & LiFePO4 4 Series Connection  14.8V & 12.8V at 30A limited


Tested Items


1 Voltage Charging voltage CC/CV
Balance voltage for single cell Li-ion:4.20 V±0.03V,
2 Current Balance current for single cell 0-130mA
Current consumption for single cell ≤20μA
Maximal continuous charging and discharging current 30A
3 Over-charge Protection Over charge detection voltage 4.25V +/- 0.025V (Li-Ion)
3.9V +/- 0.025V (LFP)
Over charge detection delay time 0.5-1.5S
Over charge release voltage 4.05V +/- 0.025V (Li-Ion)
3.8V +/-0.025V (LFP)
4 Over-discharge Protection Over discharge detection voltage 2.5V +/- 0.07V (Li-Ion)
2.0V +/-0.05V (LFP)
Over discharge detection delay time 100-200mS
Over discharge release voltage 3.0V +/-0.1V (Li-Ion)
2.3V +/-0.05V (LFP)
5 Over-Current Protection Over current detection voltage 0.6V +/- 0.1V
Over current detection current 90-110A
Detection delay time 5-15ms
Release condition Cut load
6 Short Protection Detection condition Exterior short circuit
Detection delay time 100-500us
Release condition Cut load
7 Resistance Protection circuitry(B+ to P+) ≤30mΩ
8 Temperature Operating temperature range -40-+85℃
Storage temperature range -40-+125℃
9 Temperature Protection Thermostat 60℃
10 Size Length x Width x Thickness 60mm*60mm*5mm (2.36″x2.36″x0.20″)


  • The PCM is specially designed for Li-Ion/Li-polymer/LiFePo4 4S 14.8V/12.8V with 30A discharging rate. It’s different from others, whose balance function is set to ensure battery  fully charged and safety.
  • PCM will detect each cell’s voltage and trim higher voltage down until other cells reach the same voltage level. Therefore, it helps batteries have longer service life.
  • In case of high constant current more than 10A,  it’s strongly recommended that additional protection components to ensure safety, for example, polyswitch, NTC, fuse,etc.
  • The safety PCM is specially designed for professionals. Mis-understanding and abuse use may cause battery damaged or overheated, even exploded.

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