PCM-S2A20 7.4V20A Balance Function

Protection Circuit Module (PCM) with Balance Function for 7.4V Li-Ion Battery Pack (20A limit)


Protection Circuit Module Specifications  For 7.4V Li-ion/Li-Po Battery  Pack
Model:PCM-S2A20 7.4V20A with balance function
Over-charge protection voltage 4.30 ± 0.025V
Over-discharge protection voltage 2.40 ± 0.080V
Balance voltage for single cell 4.20V±0.025V
Over-current protection 33~47A
Maximal continuous Discharging current 20A
Maximal Current consumption 30uA
Short circuit protection Automatic Recovery
Protection  circuitry  resistance ≤30mΩ
Dimension 120mm(4.72″) x 37mm(1.46″) x 4mm(0.16″)
Weight 23 grams (0.81OZ)


  • In case of high constant current more than 10A,  it’s strongly recommended that additional protection components to protect the battery itself, for example, polyswitch, NTC, fuse,etc.
  • The safety PCM is specially designed for professionals. Mis-understanding and abuse use may cause battery damaged or over-heated, even exploded.
  • Please don’t use the PCM for lower capacity or low drain LiFePO4 pack.  Make sure your LiFePO4 Battery pack can handle 20A drain current before buying
  • To achieve balance, each cell in battery pack must has equal voltage within tolerance of 0.2V.

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